I'd heard about the 16 Personalities quiz around the old interwebs but figured it would be just as silly and basic as any other quiz. So I took it and was shocked when my results came up to be scary accurate. Apparently I'm an ISFJ - dedicated, loyal, the social introvert who retains information like crazy, is always more concerned about others than myself, is somehow both a constant procrastinator and completely reliable, and has a tendency to bottle up my own emotions. It was pretty amazing. There was no part of it where I was thinking, "Hmm, nope that part's not me". It was bang on. It even said that ISFJs will commonly work as public servants.
It's a fun way to kill 10 minutes if nothing else - go check it out and let me know what you turn out to be! You can take the quiz here.