This "momentous event" is already available for those who've pre-ordered already, so just fire up your next game of TF2 for Bill's hat.
"For the first time in history, two separate Valve universes collide. That's right: it's a Left 4 Dead/Team Fortress 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!"
Valve has "intricate back-story" that totally explains everything: "while conducting a science experiment on parallel dimensions, Bill's hat fell off a table into the Team Fortress universe."their heart out to inform all of this good cheer, and even provide us an air-tight
"Will you get to wear Bill's hat right now, in TF2? Go ahead and hold your breath—now exhale like a champ, because you're a winner and it's happening." Well, go get it!
Valve declare Left 4 Dead/Team Fortress crossover with Bill's hat
03 November 2009 | By Simon Priest