some original (as far as i know) knock knock jokes that don't use bad puns fasten your seat belts Knock Knock Who's there? the police the police who? sir you are obviously high, we are going to have to detain you for questioning Knock Knock Who's there? if you could just sign here for your package if you could just..... thank you(proceed to walk away, go to car, and drive away) Knock Knock Who's there? the police the police who? sir this is no time for jokes, your son is dead