Drink while you think is ace. Especially when you play with a mate who is rubbish. I had to draw the line when he got a Y and tried passing off Yono Bono as John Lennon's wife the excuse of "you know who I mean" didn't stop me from making him down his pint.
For weekends away a good game of "tokens" is good. Get two smallish football figurines (those plastic ones) and distribute one to one member of the group and another to another. The object of the game is you all have to drink pints, well all drinks need to be in glasses. If a figurine ends up in your glass you have to drink two fingers, if both end up in your drink you finish your pint and then have to go and get the same drink in. Left hand (or at least not your strongest hand) has to be used to drink, otherwise you have to finish your drink.
We had a great weekend out in Amsterdam playing that a few years ago.
we did that with a solitary golf ball, except you had to neck whatever you had left. theres a knack to avoid it happening to you and you could get the same person over and over. he passed out in the end, it was ace