Been so long
When it was my turn to have blood drawn, he asked me which arm I'd prefer to have the blood taken from. I froze. Based on my extensive experience with the clinic vampires, I know that one arm almost always blows out, and one arm almost always yields a bruise-free, nearly painless experience. Except it had been so long since I last had blood drawn that I couldn't remember which arm was the good arm.
I know--can you imagine? I would never, ever have thought that this piece of information could be burned away from my brain. But apparently it has, so I had to guess. Based on the nasty green and purple bruise an inch and a half in diameter in the crook of my left elbow, I guessed completely wrong.
(Or maybe it was just that the "doctor" had no butterfly needles on him and stuck me with what felt like a knitting needle. Ugh.)