There's this weird phenomenon that goes on in the law school library. No, I'm not referring to studying. I'm talking about laptop-watching. You're sitting at a table with a complete stranger; this person is clearly a fellow law student, but you've never seen her before in your life. As she gets up to go to the bathroom, she says, "Would you mind watching my stuff?" And you smile, nod affirmatively, and then dutifully keep half an eyeball on her laptop.
Every time I do this (and I've been on the other side too), I shake my head. Why would a stranger care about your stuff? But personally, I can't help myself: if someone puts her most valuable possession under my watch, I gotta respect that responsibility.