Bigfoot is just a normal person who covered himself in Pritt Stick and went down on Susan Boyle.
Bigfoot's Secret
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is saying Bigfoot, the hairy cryptid, is actually a dude covered in glue who performed oral sex on Susan Boyle. Get it? You're probably still using dial-up, aren't you?