Voldemort: Knock, knock.
Harry Potter: Who's there?
Voldemort: You know.
Harry Potter: You know who?
Voldemort: Exactly!
Voldemort Knock-Knock
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Explanation
Explain Bear
Alright, listen up buttercup. This joke plays on the fact that Voldemort is often referred to as "You-Know-Who" in the Harry Potter books because people are too scared to say his actual name. So, Voldemort uses this fear in a knock-knock joke. Get it? Probably not, you are not a smart cookie.