There are always unwritten rules: don’t touch the aux if you don’t know what you’re doing, don’t bring randoms without asking, and there’s always that one guy who steals food from the fridge.
…
At my campus, the golden rule is: never show up before 10 PM — if you do, you’re basically helping the host clean. 
Also, if you start a game of pong, you better finish it. Nothing kills the vibe faster than someone walking away mid-game
the unspoken rule is: never start a group game without checking everyone’s tolerance for competitiveness. I saw a dude rage-quit beer pong mid-tournament last semester and almost flip the table.
People act chill until someone misses an easy shot.
At Arizona State, there’s this unspoken rule:
if you’re late, you bring ice. Doesn’t matter if it’s a frat house, apartment, or random pool party — you show up empty-handed and everyone’s like “where’s the ice?”
Apparently ice is the universal party currency
Ohhh this one’s funny! at my campus everyone knows you never, ever grab snacks from the RA lounge. It’s basically a no-go zone, but somehow people still test it every semester. 
At my campus the real silent rule was this one:
If you open the host’s bedroom door and you’re not the host you automatically get roasted for the rest of the semester.
Didn’t matter why you opened it. Someone always yells “WRONG ROOM” and suddenly the entire party knows your name