Saw a [link to this](http://www.moviecynics.com/item/1260) in the comments section at [IMDb](http://imdb.com/title/tt0810988/).
1 drink every time someone drinks
1 drink every time someone says “Nine”
1 drink every time you see the number nine or can make the number nine from something on screen
1 drink every time you see a pug dog or a picture of one
1 drink every time you see the main character’s green friendship bracelet
Note: I don’t actually recommend this, because you’ll probably get alcohol poisoning.