Play "Baby One More Time" by Britney Spears. Drink twice when she asks you to "give her a sign". Drink once when she asks you to "hit me". They come back to back, so be a quick drink!
Another one can be played to the video for Crazy. Drink when she says "Crazy". Chug beer at the end of the video, when she bends over in the chair in her skimpy green halter top and gives you a view!