user
Given a cartoon image and a caption. Caption: Not now—I'm in the middle of a big case. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A play on words: to be "in the middle of a big case" to a lawyer would usually mean that they are busy in the process of litigating an important legal case. But here: the "case" is a literal briefcase, and the lawyer is standing in the middle of it.