Oh, definitely the buttons. I've been known to snip all the buttons off a jacket and make it "open-front" instead of sewing back the one that fell off!
Hemming pants is another one... I always say I should just do it myself. But my sewing table got turned into a "home improvement" table, which shows you where my priorities lie. In my defence, there are only two professional tailors within a forty-minute radius of my house, and they both get so backed up this time of year (weddings, proms, graduations) that even if I did want to pay someone to do it for me, I probably wouldn't get my stuff back 'til August.
I'm good about taking things to consignment, but the donation bags just sit and sit. I need a monetary incentive apparently.