user
Given a cartoon image and a caption. Caption: I can't believe my eye! Question: Generating an explanation of why this image/caption combination is funny. Answer: 
assistant
A person doing a fancy dive off the end of a plank is unusual, because this is usually used as a method of execution; so pirate on the ship is surprised, but instead of saying "I can't believe my eyes," a normal expression indicating surprise, he says "my eye" because he's a pirate wearing a traditional pirate eyepatch, which causes him to only be able to see out of one eye.