A nosy neighbor is constantly prying into your personal life- spreading gossip and making unwelcome comments.
Respond to their inquiries with increasingly outlandish and fantastical stories- gradually escalating the absurdity until they question their own sanity.
Invent a secret identity as a superhero or international spy- complete with a detailed backstory and elaborate gadgets. Bonus points for a hidden lair (or at least a cardboard box).
Feign sudden amnesia- forgetting your own name- address- and any details about your personal life. Stare blankly and ask them for directions to your own house.
If confronted with gossip- 'confess' to even more scandalous and improbable activities- outdoing the rumor mill and leaving them speechless.
Install a motion-activated sprinkler system that targets anyone who lingers near your property line for too long. Bonus points for adding glitter or rainbow dye to the water.
Curiosity's sting-Whispers grow- truth takes a hike-Laughter builds a wall.