when i was bouncing at wild bills awhile back when i couldnt find work straight out the army i had a chick hit another chick in the head with a beer bottle in the smoking area a few feet from me, it exploded just like in the movies lol. never though that would actually happen either till i saw it. she only had a small gash on her head, didnt bleed bad at all.
From what I've witnessed, the damage is generally worse if the bottle doesn't break.