When a ziplock bag is filled with booze, turned upside down, the corners are snipped off, and flipped over for two drinkers to suckle. Since you can't use your hands there is always a small melee being fought to control your teet and the probability of the drinkers soaking themselves and others is very high.
Results are best when the drinkers are shirtless and grappling.
Rodd:"Aww shit, John just filled a ziplock with half a fifth of Jim Beam..."
Everyone:"BIRTH OF ROME!"
Todd:"Shit. I guess I'm Remus"
Rodd:"Cool, I got Romulus"