All Blues drink
All Reds drink
The person who picks this card chooses one player on each side to do rock-paper-scissors, best of three. The losing side drinks.
Reds get to distribute 5 seconds' worth of drinking to one (or more) of the Blues.
For the rest of the game, the person who picks this card is on the other side! (Switch colors if you can.)
The last person to duck and cover drinks "like it's the end of the world."
(They finish their drink while everyone else makes air raid noises.)
The person who picks this card challenges a foe on the other side to a staring contest. The losing side drinks.
Reds all take the same very quick sip. Nobody is satisfied.
Find (or call) someone who isn't playing, and get them to make up a rule on the spot.
(Rules can stack unless agreed otherwise.)
The person who picked this card picks a foe on the other side, who now has to drink whenever the picker does.
(This lasts until the next J is picked.)
Nobody (on any side) can talk to the person who picked this card. If someone does, nobody can talk to them, either.
"From each according to his beer, to each according to his thirst." (Cheers to all!)
This card triggers a flip cup race between both sides! Winners play their national anthem and celebrate. Losers feel shame.