20 Knock-Knock Jokes Your Dad Will Love

William Shakespeare changed the world with his uproarious comedies and harrowing tragedies that would ultimately culminate in 2011’s Gnomeo & Juliet. But the Bard has yet another feather in his cap: inadvertently setting up a dad-approved knock-knock joke.

“When going to see a production of Hamlet, just before the show starts lean to the person next to you and say ‘Knock Knock,’” advised one Redditor when asked to recount the best joke of its kind. “The first line of the show is ‘Who’s there?’”

While that particular set-up requires very specific circumstances, other Redditors have chimed in with knock-knock jokes that don’t require any Shakespearean knowledge whatsoever. Whether it’s a grammar gag or a pencil pun, here are a few variations of the formulaic favorite that your dad will love…