So I was just wondering, do all tanks have a psychic link to each other or something? How do people decide who is MT and who is OT, especially in things like CT/other more-than-one-tank situations.

I almost never see any discussions about this in the dungeons.

One day I'm hoping to do some tanking (when it doesn't make me nervous thinking about it) and I'd rather not make myself out to be more of an idiot than I probably already seem.