US fraternities are the burger version of UK boarding school noncery. At its core, a frat just a social club for drinking, social networking for careers after school, and organized sexual assault of female classmates. The latter activity replaces the british pederastry since frats are college only and most US colleges are co-ed.
Freshmen wanting to join a frat ("prospects") will "rush" it during "rush week" which always involves dangerous levels of alcohol consumption and arcane hazing rituals, as seen above.
I have very little context here, but I'm guessing the ritual is to stand completely still in a dark wet basement while a stereo randomly blares scary noises from the other room. Any prospects that react are eliminated and can't join the frat.
For an entirely different flavor of toxic american culture see Sororities.
the frat guy just continuing to drink a beer while very clearly trying not to get arrested for having 50 18yos standing shirtless in a dark basement.

doesn't have a culture