I'm working on a full scale review of Left 4 Dead for The Mercury as you read these words, but something has been sticking in my craw since I started playing the game almost a week back.
I don't know that I can express my feelings on the subject with the necessary eloquence -- such is my rage -- so instead I'll rely on The Critic to elucidate on my behalf (as is my wont in matters of great import).
Get all that?
Now replace the avian pilot with a sprinting zombie and you'll begin to grasp what I'm getting at.
Post Script: The followup clip is also pretty relevant, assuming your powerful imagination can replace "stewardesses" with "ragtag zombocalypse survivors," and the "bagged" euphemism with the phrase "vomited onto."