I've tried to CTRL-Z in life several times before realising there isn't one. My left hand even starts to move.
Speaking of which, I have a question from 5 days ago: SWB, sir, why do you always use "Save As" and then overwrite the same file during your recorded animations, instead of just hitting Save? Doesn't that confirmation dialogue get on your nerves after a while?
Also, my up key doesn't work in many browser text boxes. It's most odd.