user
Given a cartoon image and a caption. Caption: What disease are you crawling for? Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A play on the idea that people run marathons for charities --- people train for running events, get their friends to sponsor them financially, and then donate the money to charity; this provides both social good and motivation for running. Here, it's not a marathon, but a desert crawling competition of some kind --- the question means: "which charity are you supporting by crawling in this event?"