Once in cross country, a teammate accidentally spit over his right shoulder....directly into my mouth. NOT COOL. so watch where you spit, especially if its windy.
Warn the group if you are going to be bathing nekkid in a nearby stream, and do it well downstream of camp.
People who snore like a chainsaw....denial doesnt cut it, and its not funny. Camp far away, or get your tent dropped on you at 3am. :)
If you bring some insanely tasty and aromatic food, and your buddies are eating unseasoned beans and rice, be descrete. Cook the bacon downwind, or share.
Nobody wants to smell your feet/socks/shoes after an 8 hour day of hiking. Especially if sharing a tent. Do what ya gotta do.
Digging a cat hole for your wifey....for real?