At college..
We smoke in the turret room of my fraternity house(its a small circular room, complete with 8 comfy chairs in a circle around a music box/table thing in the middle. Plants or tree stumps as well as trays for breaking up bud between each seat. Cool painting on the ceiling and just a bunch of neat pictures, plants and other stuff in the room. People add things occasionally, but its remained relatively the same over the last 35 years)
Pass to the right, usually we just smoke out of glass, whoever packed the bowl gets the first hit.
Always use a bic, never white nor yellow
10 minute rule on the seats. You can call 10 minute and leave the seat for no more than 10 minutes and come back and sit there(During parties, the seats fill up really quickly, so we established this rule)
4/20 - we bring out the party bowl. Its this giant glass spoon that holds about a quarter. It usually gets packed a few times

At friends houses - usually just smoke in front of a t.v.
At home(summer) by myself - I usually just smoke on the patio.