Buffy Jr's newest Knock-Knock joke*:
Her: Knock Knock
Me: Who's there?
Me: Night who?
Her: No, Knifffffffe!
Me: Oh. Knife who?
Her: Zombie I'm gonna cut your head off with a knife!!!
*Just a note: Buffy Jr is CONSTANTLY creating Knock-Knock jokes. Most of the time they make zero sense but they are super cute. And if you don't say "Who's there?".....god help you.