user
Given a cartoon image and a caption. Caption: Let's let him keep your ball. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
The monster took the ball the dog was playing with prior to this --- because the monster is quite intimidating, the man decides to tell his dog that they will not risk the danger, and will simply let the evil looking monster keep ball. This is funny in part because, instead of running away, the man nonchalantly and calmly states the course of action.