The ESRB wouldn't let Valve release the cinematic trailer for Left 4 Dead 2, so what did they do? They "leaked" it, obviously

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…