I just kinda think of libraries and movies as places you go in order to keep your eyes on something other than your friends, and be quiet. =P If you meet, why not let loose? I'm betting most of these people haven't even had a fulfilling experience like that. A real going-out in style.
I'm with this fella, Libraries and Movies usually are required to maintain quiet while yer there. In certain places in some areas however, you are allowed to speak, but in a tone so you won't disrupt everyone else.
Here in the US you must be 21 to get wasted, but I've seen kids my age break the law an get thier little asses in trouble with thier parents, which makes them very selective to groups they hang out with (mostly those that look like they have came out of prison or something, two words: Actual Experience. I have experinced this myself, because people at the school I used to go to actually look like they come from downtown NYC).