6 or More
You divide the players up into two teams of equal numbers. Each team stands side by side at the opposite side of a large table. Each player has one cup with the same quantity of alcohol in it.
A designated player shouts “Go!” and the first person on each team has to finish their entire drink as fast as they can. Once that player has finished they must place the cup upside down on their head to ensure it’s finished. The next player cannot start until the original person has finished. The first team to finish all their drinks wins.
The winning team gets to pick a shot of choice and each member of the losing team must take a shot of it.
This game is often played with bottles and straws (Strawpedo’s) rather than cups of alcohol.