Q) What do you call Iron Man when he can't swim?
A) Robert Drowney Jr.
Iron Man's Swimming Problem Answered with Wordplay on Robert Downey Jr.'s Name and "Drowning."
Explanation
Explain Bear
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.