I can’t believe I’ve lived so long and not heard this genius gag… if it’s old news I apologise but if you haven’t heard this it’s brillinat. OK, drum roll a-and:
That’s it… genius right? Make someone’s day and tell them this gag… However, if this is the oldest knock, knock joke in the world do leave a comment and let me know because I’ve never heard this before today.
If you need some substance to your gags though here are The 60 Funniest Jokes Ever (and some of the worst).