Etiquette

Stupid title for the post, but please, someone tell me the reasoning behind this. Why, in an empty computer lab do people feel that they should plunk down at the computer next to you even though there are plenty of other ones turned on and the one beside you isn't??????????? Gah. Stupid people. Oh bonus. I just ran into a guy who thinks he is on the flippin top of the world. He is good looking but darnit he never forgets it. He's got this way about him that makes me feel like a speck of dust. And his nose is always in the flippin air. I mean, come on. Come back to earth for a while.