Waterfalls sounds very much like how we play Ring of Fire.

I might as well explain all of mine briefly, just in case:

Mushroom - similar to W/F and RoF. You put the card on top of the drink after your go, with two corners showing. If anything happens, you down the pint.
Arrogance - poor drink into pint glass (as much or as little as you dare - arrogance). Flip a coin. Guess what it lands on right, and it moves on to the next person. A good run can end in a very dirty pint.
Slaps - counting game, one to eleven. Whoever gets eleven has to drink.
21 - same as above, but up to twenty-one.
Fuzzy Duck - Ducky Fuzz, Fucky Duzz, oh shit, drink.
What the Fuck - What's the name of the fucking game? WHAT THE FUCK! Lenny fuck, what the fuck, how about a Spector fuck? etc.