I've been told on multiple occasions that I'm a really good liar. It's not really that I particularly enjoy doing it either, it just has to be done from time to time. I often find myself in a situation where telling the truth will have dire consequences, so I do what just comes natural - I tell a fat, odious lie.
Rest assured, I never lie about myself or my personality. I'm a typically honest person, and I can't stand it when people try being something they're not. But all the same, when an instructor wants to know what you're doing at your old high school campus without permission, it's much easier just to lie and say you're shadowing the ENL teacher, then show your college ID, versus saying, "I just feel like hangin' around, you know?"