This is not a good sign

The following dialogue shows how stupid I've gotten in the last six hours. I'm trying to keep pain and swelling under control (I.E., before the barfing line), so I've had to take Percocet again. The following dialogue shows just how out of sorts I've been feeling today:
Professor: What are your favorite Haloween costumes?
Me: Mine was when I dressed up as one of the three blind mice.
Professor: Which one.
Me: Um... I don't know. I didn't know there was more than one.
Pause...