A Michael Jackson knock-knock joke I would only perform this joke if A) You've seen the South Park episode with MJ and B) You don't mind hitting a high note in front of a crowd. This isn't your typical joke because the punchline relies on the delivery of the person you are telling the joke to. If done right, it's hilarious--just have faith in me, I've tried it plenty of times. ========= First say ""Hey, I've got a Michael Jackson joke for you."" (it will help them get the ""punchline"" because o…