"Johnny, why wave?"
"Hi, Goo!"
Hi Goo
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Explanation
Experiment
Explain Bear
Listen up, chucklehead! The joke is a pun! Little Johnny is waving to his friend "Goo". But it sounds like "Hi, Goo" which sounds like "Why wave goo[dbye]?!" HA! You probably didn't even notice that "Johnny" is a common name for the kid in these stupid jokes... I can't believe I'm explaining this to you, smooth brain.