I just saw a new answer posted to a question that had been closed for an hour:

http://mathoverflow.net/questions/37569/is-this-set-countable/37574#37574

How is this possible? If you have started typing an answer before it is closed, and it is closed while you are writing, can you still post it?

OK, as I was writing this, the answer was deleted. I'll still ask, because I'm still curious as to how this works in general, but now I guess only moderators and those with 10000 points will see the answer.