Participants are recommend to use a lower-percentage drink (i.e. lager or cider), and while watching an episode of Friends, each participant must continuously swig their drink (chug) while Ross is on screen. The game lasts for the first eight minutes of the episode, hence "Eight Minutes of Ross."
Participants must drink regardless of how much of Ross is on screen. Even if just his elbow or the top of his head is on screen, participants must drink.
B: Erm, do you know Eight Minutes of Ross?
A: I love Eight Minutes of Ross, I couldn't stand up the last time I played that!