Petty annoyance of the day: me, sat in the library using one of the many electronic catalogue computers. Then feels a presence behind me, and there's a girl, arms folded, staaaaaaring at the screen that I'm using.
Me: Can I help you?
-I'm waiting for that computer.
-Can't you use one of those? (several free machines; though admittedly she would have had to walk 30 feet to get to them).
-No.
-Oh.
She was there for bloody ages...hard to concentrate with a pair of beady eyes watching you. In the end I got up and pulled out the chair for her, and told her to please, take a seat (sracastically). Would have told her to bugger off but she may end up in my project group next year.