Vanity at the DMV
Last year I bought the house. It turns out, when you buy a house they want you to have a valid form of ID (especially when you goto the bank and ask for $7k+ check from your account to pay for closing costs). This forced me to again realize that my driver's license had expired in June. I knew about it before then.. airport security gets very cranky if you fly with an expired license.. but I'd forgotten all about it (add to that, since you have the license for 5-7 years it seemed silly to get it for the wrong address when I -knew- I was moving).