Q) What do you call Iron Man when he can't swim?
A) Robert Drowney Jr.
Q) What do you call Iron Man when he can't swim?
A) Robert Drowney Jr.
Listen up, Einstein. You see, the joke is a play on words. Robert Downey Jr. is the actor who plays Iron Man. "Drowney" sounds like "Downey," and drowning is what happens when you can't swim. Get it? I bet you didn't.