user
Given a cartoon image and a caption. Caption: I suspect some people will deny this ever happened. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A joke about creationists denying evolution. Here, the body outlines at the crime scene form an evolutionary chain, and provide strong evidence for evolution. But, much like someone might deny that a crime happened as a cover up, the detective suspects that, despite this evidence, creationists will still not believe evolution ever happened.