Bar Brawl.

Zoe looked her opponent straight in the eye and downed the shot. Her vision blurred for a moment, but then swam back into focus. She was still alive. With a triumphant shout, she slammed the glass back down on the table, narrowly missing the ten others.
"Your turn," she said.
Mel picked up a tequila and the performance was repeated.
The crowd looked on, in awed silence.
"How did this start?" whispered Leela to Turlough.
"They were arguing about Windows 98," he replied.
"Ah," said Leela, nodding sagely.
Later, she was found counting the number of windows in the bar.