German ladies selecting a designated driver.

The ride is called The Devil's Wheel, and probably began years ago as a way for German men to see up the dresses of inebriated fräuleins, then became an Oktoberfest tradition after they realized how well it worked. The idea of the game is to be the last girl left on the giant wheel. The prize for that accomplishment is getting roped like a rodeo calf by a bully in a red Izod shirt. Doesn't seem like much of an incentive, but I'm not going to argue with tradition.

Sources: BroBible