Prop bet, also called a side bet, prop, or exotic, is a bet made on an outcome or a proposition. These can be anything from statistics and happenstance in a regular game to personal, one-of-a-kind bets.

Poker is a thoroughly entertaining game, from the suck-outs to the sick reads to the tournament bubble boys. But you know what’s really exciting? Poker pros like Tony G and Daniel Negreanu making prop bets on any type of oddity to feed their action junkie instincts.

The play at the tables is clearly not enough to satisfy the impulse of these professional players, as there are hundreds of documented incidents (most hilarious) of prop bets ranging from marshmallow mouth stuffing to a prop bets championship title. Who wouldn’t want to see Tony G compete in a foot race with a professional basketball player running backwards? Or Gavin Smith stuff his face with marshmallows while Phil Laak keeps an eagle eye on the clock?

Below are five of some of the more remarkable prop bets made in the last couple of years:

Tony G’s midnight prop bet with basketball pro Nick Lackovic…running backwards

The Prop Bets Championship (1 & 2)

Tom Dwan, Phil Laak, Antonio Esfandiari Prop Bet Showdown

Mike Matusow 60 lb. Weight Loss Prop Bet

Gavin Smith’s and Phil Laak’s Mouth-Stuffing Marshmallow Prop Bet