user
Given a cartoon image and a caption. Caption: He needed a place to park his wheel. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A person might construct a garage because they want to park their car in it; but because cavemen don't have cars, the joke is that the caveman was looking for a place to park his carved wheel, which is a common trope associated with cavemen. It's funny in part because the construction of a modern garage implies technological advancement, whereas the stone wheel is primitive.