Once upon a time, some absent student left their computer active so after a while I decided to go on to their user drive, copy everything into a hidden folder and leave only a word document in the normal bit saying "all your files have been deleted - don't leave your account open... only joking, they're in this hidden directory". I thought I was doing good in a sadistic way, but it all went horribly, horribly tits up as I somehow ended up deleting a whole pile of files rather than copying them. I was terrified for the rest of the week that I was going to be caught on camera and booted from the uni or something. I still feel pretty bad about it hoping there weren't any final year reports or whatever in there.
I quite like it in some normal libraries where you get 30 min sessions. If there's nobody around then you can just start up another one, otherwise somebody else in need gets a shot. You'd probably extend that for unis though as you wouldn't get much of a report typed out in that time. Anyone on Facebook for more than 5 mins should be punted though. Pisses me of in hostels when you want to check out maps, places to see / eat or whatever but there's always someone sitting on Facebook uploading their holiday pics to show off to the world. F**k off!