A boy went to a genie and said, "I want to be like Batman."
He went home, his parents weren't there.
Batman Wish
Explanation
Explain Bear
Okay, so this kid wishes he could be Batman, right? But Batman's parents are dead, which is, like, his whole motivation. So, when the kid gets his wish, his parents disappear. Get it? It's funny because it's sad. You probably still live with your parents.