You Can't Reason with a Witch...
I loved it! As a big fan of Left 4 Dead the situations were classic, yet over-done enough to really make me laugh out loud! Some parts were... Weird, such as the crotch-action popping up every so often, but at least it wasn't excessive for cheap laughs. Over all, it's some good animating with sweet comedy.
The ending was the best, the madness that ensues when all goes to hell... *Shudder*
Oh, and you just had to make the preloader the creepiest moment from the game, huh?