A shared counter. Tap yours up as the night goes on — the tally is live on every phone in the room.
One wheel of dares for the whole room. Anyone spins; every phone lands on the same slice at the same moment, and a landed slice never comes back.
A disposable camera. Photos drop into a locked roll nobody can open until it develops at 9am tomorrow — each shot stamped with the shooter's drink count.
One wheel, one disposable camera, everyone's phone. Spins land on every screen at once; photos drop into a locked roll that develops at 9am tomorrow.