Funny how the rules on this list are so universal, and yet so organic. These are the exact same rules my friends and I abide by, they just developed naturally over time.
There is one thing that annoys me during sessions. Normally, I supply the weed (because my friends are too cheap to do it themselves...but whatever, it's fine with me), and I like to think that my generosity is appreciated. Now, I'll be the first to admit, after three or four bowls I tend to babysit the pipe because I get sidetracked talking or listening to somebody else. What really pisses me off is when someone starts complaining about it. It feels like such a slap in the face, especially when smoking them out time and time and again. It's not like I don't plan on taking my hit, but I like to think of sessions as a social venture, and not just a way for someone else to smoke all my weed.