Batman [Post Super Heroes Mini-Comic] #1

Joker makes a bet with his henchmen that he can get Batman to laugh. He uses laughing gas to rob the audience at the circus, and when Batman and Robin show up, he uses the gas on Batman. Not amused, Batman doesn't breathe it in, causing Joker to use a joy buzzer. That doesn't work either, as Batman dunks Joker in a water tank. With Joker behind bars, Batman finally does laugh, as Joker's suit has shrunk.