1 "Knock knock."
2 "Who's there?"
1 "Interrupting physicist."
2 "Interrupting who?"
1 "Muon!!!"
Interrupting Physicist
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Explanation
Experiment
Explain Bear
Alright, listen up, smarty pants. This joke is funny because the physicist interrupts the "who" in "Interrupting who?" to say "Muon," which is a subatomic particle. It's a play on words because it sounds like "move on." Get it? Probably not, you're probably still trying to figure out how to tie your shoes.