So you think we came from monkeys
The retort "'So you think we came from monkeys?" usually are derived from the misunderstanding or intentional distortion of scientific conclusions. They are examples of straw man fallacies, as well as prime examples of appeal to emotion and wishful thinking at their core: Reality and Facts are NOT about what we desire to be true. One famous usage was in the 1860 Wilberforce-Huxley debate:
- "[Bishop Wilberforce] chafed him and asked whether he had a preference for the descent being on the father's side or the mother's side?"
We came from pond soup
This retort refers to the theory of abiogenesis, the theory that life originated from non-living matter. This theory often is interpreted by the apologist to mean that there existed a single small pond wherein amino acids were formed by electricity, such as from lightning. This description, for reasons that are unclear, condescendingly refers to mixtures of elements and compounds in this hypothetical pool as "soup". Are the ocean, rain puddles, and lakes also comprised of "soup"? Clearly, the phrase "pond soup" is meant as a rhetorical tactic and not a reasonable description of the theory. Also, the notion that there was a single pond that spawned life is probably missing the point of the theory; there would have existed innumerable environments across earth in which different reactions occurred under different conditions, vastly increasing the probability that self-replicating compounds might arise. All the "hopes" for the future of life did not rest in a single pond.
Furthermore, the Miller-Urey experiment on the chemical origins of life demonstrated that organic compounds forming the building blocks for life on Earth can be synthesized naturally through chemical reactions. It provided evidence in support of abiogenesis, because in showed that natural processes facilitate readily-available complex molecules that plausibly form precursors to life. Of course, this does not imply that such molecules were intended to create life, but that any early life arising would necessarily incorporate such molecules. Rejecting the theory of abiogenesis based on the retort, "You think we came from pond soup," utterly misses the evidence for the theory in favor of sloganeering.
We came from dirt/rocks/clay
This retort also refers to the theory of abiogenesis. It suffers from the same shortcomings as the 'pond soup' retort, namely the strong evidence that components for life arise from nonliving matter through purely natural means.
If the theist is a Biblical literalist, the atheist could point out that the book of Genesis says that God made man from dirt. However, such a statement doesn't do much to advance the breadth or depth of the discussion. It does however show the hypocrisy and Special pleading in the theist's argument, seeing their own "version" of the same claim as better than that of others.
We came from nothing
Typically, this version of the retort is in reference to the Big Bang. It has been used by apologists, such as Ray Comfort and Kirk Cameron, who featured it in an episode of their television series, "The Way of the Master." The retort is generally used flippantly, without evidence of real understanding. Since science does not yet have any answers about what happened before the Big Bang, the intellectually honest position taken by most atheists and most scientists is, "I don't know." If a fellow atheist does invoke the Big Bang as evidence for something from nothing, it is appropriate to question his or her understanding of the theory.
The Big Bang is often misinterpreted as a "something from nothing" proposition. In fact, the Big Bang doesn't suggest any particular origin for the singularity, the infinitely dense and hot point of matter from which the universe was born. Some physicists, such as Victor Stenger, have developed hypotheses about how the universe could represent "something from nothing", but such hypotheses are not yet tested. In reality, the Big Bang theory 1) is limited to the measurable universe, and makes no claims about "before" the measurable universe, and 2) is based on the uncontroversial observation that the universe appears to be expanding from a point since the beginning of time. Ultimately, it is difficult to argue that something had to exist "before" the big bang, as space and time began with the Big Bang. "Before" and "after" and "cause and effect" are notions necessarily applied within our space-time. Is there a reason to believe such notions as "something can't come from nothing" can be applied effectively to "pre"-Big Bang?
To assert that the Big Bang absurdly represents something from nothing but God reasonably represents something from something is to grossly misunderstand both the Big Bang theory and the philosophical problems of the origins of God. The atheist can point out that all attempts to understand the origin of existence requires "something from nothing", including the existence of God himself.
Abiogenesis and Evolution are also occasionally misunderstood to be "something from nothing" concepts, but they absolutely are not. Any theory that invokes natural/physical explanations and is confined to the matter of the existing universe is not a "something from nothing" proposition.
If we came from monkeys, why are there still monkeys?
This version of the retort refers to evolution, especially the origins of the human species. A common misconception about evolution is that we evolved from the monkeys and apes we see today. This ignorance forms the basis for the question, "If we evolved from monkeys and apes, then why are there still monkeys and apes?"
Part of the difficulty of this issue is definitional. "Monkeys" and "Apes" describe families on the primate branch of the evolutionary tree of life on Earth. Modern Homo sapiens, along with gorillas, chimpanzees, and other apes, belong to the "Great Ape" family (also known as Hominidae). These species are more closely related to one another than they are to any other species on Earth, based on overwhelming evidence. Therefore, it is clear that all the apes share a common ancestor in the past, and that all the apes plus all the monkeys together share a common ancestor even further back. This common ancestor to apes and monkeys was NOT any of the primates that exist today, but a species that was ancestral to all the modern apes and monkeys.
In essence, the various species of apes and monkeys can be thought of colloquially as "cousins". A person who exists today, upon hearing they are related to their cousins, would not think to retort, "You think I came from my cousins?" Likewise, a person, upon hearing that humans are related to their evolutionary cousins, would be mistaken to retort, "You think I came from my evolutionary cousins?" If a theist wants to challenge the view that humans share a common ancestor with other primates, he or she should first understand the nature of the claim and the evidence available to support it. This retort demonstrates that the claimant understands neither.
Something that creationists are incorrect about is their view that evolutionary change occurs in a straight line of descent, like a ladder of progress from the oldest species to the newest species. In reality, diversification of species is more appropriately seen as a branching process instead of a ladder-like process. Therefore, evolutionary relationships are depicted as "trees" showing the relationships between all the different organisms on Earth. Modern humans, monkeys, and apes evolved from different common ancestors that branched off to form a tree of species, in different families, in which we are included.
There are approximately 5,400 known species of mammals on the planet, all of which can be traced back to original mammal lineages arising and flourishing after the reptiles were apparently decimated by the effects of a comet or asteroid that impacted the earth some 65 million years ago. Primates can be traced to a single lineage that branched off from the other mammal lineages around this time. Over time, the primate lineage diversified, and species went extinct while others didn't. After humans, chimpanzees, and bonobos became distinct groups derived from their shared common ancestor, several additional species of hominids arose in the Homo genus, such as Homo erectus, Homo neanderthalensis and Homo sapiens. Out of those nine species, only one avoided extinction: Homo sapiens (humans). Ours is a remarkable story of evolutionary change and survival spanning eras. "You think we came from monkeys/apes" utterly misses out on all that evolutionary biology has shown us about who we are and where we come from.
The following questions mirror the logic or understanding of this retort. There are two groups of arguments.
Group 1 are those arguments that assume members of a group come from their modern relatives:
- If I came from cousins, why do my cousins still exist?
- If the English language came from German, why do people still speak German?
Group 2 are those arguments that imply all members of a group must change in unison:
- If dogs are domesticated from wolves, why do wolves still exist?
- If corn is domesticated from a grass, why does grass still exist?
- If Americans came from Europe, why are there still Europeans?
- [if they believe the Genesis creation myth:] If women came from a rib, why are there still ribs? If man came from dirt, why is there still dirt?
No shame in being an ape
This argument is often based on the supposed shame of being related to a monkey. A classic rebuttal was made reportedly made by Thomas Henry Huxley in the 1860 Oxford evolution debate, arguing he was more ashamed of being related to deceptive human apologists:
- "I asserted–and I repeat–that a man has no reason to be ashamed of having an ape for his grandfather. If there were an ancestor whom I should feel shame in recalling it would rather be a man–a man of restless and versatile intellect–who, not content with an equivocal success in his own sphere of activity, plunges into scientific questions with which he has no real acquaintance, only to obscure them by an aimless rhetoric, and distract the attention of his hearers from the real point at issue by eloquent digressions and skilled appeals to religious prejudice."
However, the exact details of the exchange are unknown and accounts of it are inconsistent. 
- 22 Messages From Creationists To People Who Believe In Evolution, Buzzfeed, February 5, 2014
- Chart answering "If humans evolved from monkeys, why are there still monkeys?"