user
Given a cartoon image and a caption. Caption: I wanted you to meet our colon specialist before we miniaturized him. Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
An allusion to "Fantastic Voyage" wherein a submarine crew gets miniaturized and sent into a person's body. In this case, the person in the diving suit is a doctor who will perform colon surgery from the inside.