My only experience of Left 4 Dead 2 is a handful of sessions in my youth where a friend handed me a controller (me, a person whose shooter experience extended to Ratchet and Clank at the time), told me nothing, and let the chaos unfold. I did not do a good job. But it left a lasting impression! Though perhaps that impression would have changed had I seen its cinematic trailer as soon as Valve had wanted to release it. The problem was, the Entertainment Software Ratings Board weren't so hot on the game, including its marketing materials, so that left Valve with one option: leaking the trailer themselves.

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