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5. The ‘Chewbacca’ Prank – “Wookie Call Spam”

Grab your friend’s phone number and post flyers around town saying, “Call this number and leave your best Chewbacca impression for a $50 prize!” (Spoiler: There’s no prize.)
For the next few days, your friend will receive a never-ending stream of strangers growling into their voicemail. Bonus points if they don’t figure out who’s behind it and start questioning their entire existence.