I agree with everyone else that I do not like the self-righteous, condescending attitude of some non-drinkers. But, for the fun ones, it's cool if that's what they want to do. It's nice to have someone who will actually listen and understand when everony is wasted and you are being a sad drunk. It's also super to have someone around who actually remembers all the funny things that happened the night before and can retell the stories!
Also, sometimes I will be the sober driver... sometimes it sucks because everyone else seems to be having more fun but sometimes it's way fun to torment the drunk girls and laugh at them being dumb.