Left 4 Dead Blog, you've killed him. A whole bunch.
Or how about the in-laws? Oh man, you murdered them cold-blooded in Left 4 Dead 2. Basically, if every person on the planet was a zombie in the game, you've killed them -- 4.26 times. That would mean you've killed them, resurrected them, killed them again -- ah, you get it.
Another interesting figure: if the average height of a zombie is six feet tall, you stacked enough undead corpses end-to-end to circle the globe 1,322 times. You know how that's in italics? That's because it's crazy. In short: you are really good at killing zombies. Hey, don't feel bad for so much genocide! That's how it goes in the zombie apocalypse.