Did you hear about the gay choirboy?
He choked on his first hymn.
Gay Choirboy's Debut Performance
Explanation
Explain Bear
Alright, listen up, you chucklehead. This joke is funny because it uses a pun, see? "Choked" sounds like "chocked," which implies a sexual act involving the choirboy and the "hymn." You wouldn't get it unless you have a brain, which you clearly don't.