Bad hair extensions. There's just no excuse for it if you have the money to spend on making yourself orange. I'm talking mis-matched blondes, plasticy, nasty looking wefted hair that's just been slopped in. Not pleasant.
On that same topic, bleach blondes that have random splodges of brown or back on their head. No, you don't look edgy, you look like a spaniel. (I'm a fine one to talk with my fake dreads, but please... at least they're one colour that match my real hair).
Blogger. It won't let me change my primary email address. Seriously... what's the point in limiting your functionality in this day and age?
IBS. Speaks for itself. It's messy, painful and debilitating.