Left for Dead (by the bots)
I guess this is only fair, I'd have done the same to them. One consolation is I thought I was playing Easy (casual speedrun for fun) but I had actually been playing Normal the whole time. One anti-consolation is that the bots blew up my carefully positioned dramatic escape fire gas cans while I was down on the ground, the jerks.
(Map: Arena of the Dead - this used to be a favourite but looking back I don't think it ever really showed up in any of my L4D videos from the old days).