It would have to be from Left 4 Dead. I was the only one alive at the end of the no mercy campaign, the chopper was ready and all I had to do was get to it. I was being chased by many zombies but more importantly, an tank. I got that feeling, you know, when you're being chased by a big bad scary monster. That is some scary sh*t man. I never made it to the chopper though, damn zombies.