Puns are a lot easier to make than knock knock jokes-all puns require is a word that contains another word, but knock knock jokes require two words that sound the same AND are relevant to people that want to enter a building, amirite?

That one is decent I suppose, but it has nothing to do with people entering houses haha. "So a guy enters ten jokes into a pun contest to see if any of them would win, but no pun in ten did" Personal favorite

I never said clever pun, I just said pun :3

True though. I've never really heard an actually funny knock knock joke. Some of my friends are just weird for liking the interrupting cow one :P

That joke is really old :3