Valve has announced that those pre-ordering Left 4 Dead 2 on PC will have access to Bill’s hat in Team Fortress 2.”For the first time in history, two separate Valve universes collide,” the text reads, in what I imagine as a deep, booming voice. “That’s right: it’s a Left 4 Dead/Team Fortress 2 crossover! This is not fan fiction! This is not a dream sequence! The characters from Team Fortress 2 will team-up with Bill’s hat from Left 4 Dead 1!”Yes, you read that right – in addition to their early access to the demo and the 10% off, pre-ordering Left 4 Dead 2 will also net you Bill’s hat. Right now. If you’ve pre-ordered Left 4 Dead 2, just fire up Team Fortress 2 now and it will be right there. Waiting for you. Which is quite creepy.And if you haven’t, you can go and pre-order now.