Most of the time, I don't watch any of the films unless it's back to back to back.
Anyways, I have a simple ritual. 10 minute bathroom break between disc 1/disc 2 changeover. 15 minute bathroom/food break between films.
And as for drinking games, actually brainstormed this with a friend one day, and saved the ideas. Here's what we got....
1 shot every time there's a close up of the Ring. 2 if there's caressing going on. 3 each time someone puts it on. Finish off whatever you're drinking when the Ring is destroyed.
*Notes: The forging of the rings scene in Fellowship is exempt. Otherwise, you'll be passed out before the title comes up.
One shot for every Legolas arrow fired. God help you during Amon Hen, Helm's Deep, and Pellenor Fields.
*Notes: Killing shots only. That's most of them, but certain ones (the Orc that sets off the bomb at Helm's Deep, the one fired at the King of the Dead) are exempt.
One shot anytime someone's drinking on screen. Two shots for unusual drinks (Ent Draught, Eowyn's stew, Whatever the hell it was the Orcs gave Merry). Three whenever there's a toast involved.
Or, the best one...the Point system. Take your shots after each of these dies on screen.
Orcs and Uruk-Hai are worth nothing (primarily because there's too damn many)
Nazgul: Defeated or retreating due to actual attacks, they're all worth 1 shot per Nazgul.
Trolls are worth 2.
Balrog: Fall in Fellowship is worth 3. "Smote his ruin upon the mountain" is worth 4.
Lurtz is worth 2.
Sharku (Warg Rider Captain) is worth 1.
Saruman is worth 3.
Wormtongue is worth 2.
Corsair PJ is worth 3!
Denethor is worth 2.
Gothmog is worth 2.
Oliphaunt Army leader (the guy blowing the horn making crazy faces during the battle) is worth 2.
Witch King is worth 3.
Shelob retreating is worth 3.
Mouth of Sauron is worth 2.
Gollum is worth 3.
Finish the bottle when Barad-Dur explodes.