No you wont get fired, but don't expect them to offer you any extra shifts or give you the nice shifts in future, i personally would take a pee in the coffee machine and leave.
Thats how I left my job in a wetherspoons pub, but the coffee machine was the ice machine
KaHn
Thats how I left my job in a wetherspoons pub, but the coffee machine was the ice machine

KaHn