From my experience all Computer-Science students have pony-tails, pimples and a strange sense of humour and Maths students have belts around their nipples, glasses, short tidy hair and a just-so way of dressing. Biology students have beards, Physics students look electrocuted and Chemistry students hide beneath their well-dressed exterior a sort of gleeful mania:
at my university... A friend of mine lost all his windows. Geology students wear hiking gear and are fascinated by rocks. Electronics students are always angry because in practice electricity never behaves as it should, and people are always blowing the Multimeters. Anyone in Law or Medicine is pretentious, because they're in Law or Medicine. Arts students make their own clothes.
I wear hemp, have long, unkempt hair and like to philosophise. Sometimes I grin for no apparent reason. I'm the guy buying to bio-friendly pickle and effectively bankrupting himself so he can't afford anything else. I also do Yoga.