The most epic swindle I ever pulled in an OTB game was to fake getting depressed as my opponent chased my queen. It was a series of staggered pawn pushes that were kicking my queen, but I saw that if he kept going with a 3rd pawn push, I'd win on the spot with a back-door sneaky discovered attack. So I start sighing and looking seriously bummed out as he made the 2nd pawn push. It worked like a charm as he picked up on my dismay and immediately pushed the 3rd pawn. I then immediately busted the game-winning tactic and he was stunned for several seconds. Then he started laughing as he realized I played him for a fool.
I drew this ending against a higher rated player:
I was white.