Computer Science - IMO a vast majority of them are extreme slackers who enjoy whining about how much work they have (though this is a characteristic shared by many students). The weird thing I've noticed about comp sci students is that, from my experience, none of them are particularly interested in new technology! I've never seen a comp sci with an overly advanced phone or an ipad!
Art students - Very bitter people and feel patronized rather quickly! Its like Art students have been conditioned to believe that everybody looks down upon them! However they are quite sociable and friendly but generally avoid mainstream/popular nightclubs and pubs!
Mech Eng - Can be divided into 2 types. 1. Very nerdy and prolific students. Dresses quite casually and tend to have a bitter outlook on their course (due to the extreme lack of females). Most of them look older than what they actually are! 2. The 'clever' student, spends minimal time studying, parties alot and hard and is able to charm most girls! The type who looks like they don't possess any knowledge at all but secretly does.
English Lit - Grammar Nazis. Quite similar to the Arts students yet they can come across as a bit pretentious and arrogant due to their, occasional, informal way of speaking. Also can be seen as boring as they are able to endure books which I consider to be fatally horrible.