user
Given a cartoon image and a caption. Caption: One of us is about to die. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
The fish can't breathe in the air and the birds can't breathe underwater. The joke plays on the ambiguity of the situation because it's not clear whether this scene is taking place under water (the bird will die) or in the air (the fish will die).