This game, in it's simplest form, is a race. The two people who choose to be partners become a three-legged team by tying one of their legs together. Then, depending on the number of teams, everyone starts at the same bar. The procedure is that each team must consume two beers (one per person). As each team finishes their beers, they quickly head onto the next establishment, preferably after paying, still joined at the leg.
The team that finishes their beers first at the last bar, wins. Wins what, I don't know. A good number of bars to play with is about five.