user
Given a cartoon image and a caption. Caption: Can't I just laugh till it hurts? Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A dominatrix is a person who consensually inflicts pain on people who have a particular fetish for experiencing pain. Here, the clown does not have that fetish for physical pain, and instead, is asking if he can laugh until it hurts, instead of undertaking the usual physical pain from the dominatrix, e.g., being whipped. It's funny because of the juxtaposition of physical pain and laughing pain.