Vanity

Time taken to dress before I got a mirror in my room: 1 minute (depending on how tight the jeans are)

Time taken to dress now I have a mirror in my room: 20 minutes and at least 3 costume changes (but at least the tight jeans are sensibly ignored)

And speaking of vanity, I saw it! Tucked away in a corner of the washroom... a nose-hair clipper! For a moment I'd thought my roommate was devoid of vanity.