A person who makes a bet with their friends to eat spicy peppers. After eating the first one, he/she hides the second pepper and pretends to re-eat the first one. Because they suck at being a trickster, they get caught. He/she is now labeled "Pepper Switch".
Frat Kid "Bro…I defenitly just saw Douchebag Doerr hide that second pepper."
Douchebag Doerr "No, that was the third one!"
Frat Kid "Oh, now dominos gives three peppers with each pizza. What a Pepper Switch"