Lots of canned soundbytes to be found in Left 4 Dead. We like 'em! It can help lighten the mood, and also reveal a bit about each of the survivor's personalities. Take this clip, for example. This clip reveals a bit about Bill. And how, faced with prospect of the end of the human race, Bill's... baser instincts kick in. Clip's after the jump, because Bill's baser instincts (and accompanying social skills) probably aren't suitable for your place of work.
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There was actually one of these floating around made from the Resident Evil Gamecube remake a few years back. It's on [ytmnd.com] somewhere. I'd try to dig it up, but my work computer doesn't have the proper quicktime codec to play them and find it.