user
Given a cartoon image and a caption. Caption: If you're so civilized, why don't you use a coaster? Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
The woman from modern times is looking at the primitive caveman: the caveman doesn't want to be looked down upon, and so argues that the modern woman is actually not so modern for a benign reason: that she's not using a coaster for her mug (which is seen as a civilized/polite thing to do).