It’s interesting how much funnier anti jokes can be than regular jokes. My guess is because it’s totally unexpected and actually makes sense. Here’s one:
Friends are like trees
[spoiler]they fall down when hit multiple times with an axe[/spoiler]
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Me to a friend: "Wanna hear my favorite knock knock joke?" Friend: "Fine, I guess." Me: "Okay, you have to start it out. Say 'knock knock!'" Friend: "Knock knock." Me: "Who's there?" Stares, waiting for response. Friend's reaction of confusion being put on the spot is hilarious.