Team Fortress 2 x Adult Swim = Robot Chicken hat.
The mystery project that Valve and Adult Swim were working on together? It was a Robot Chicken-themed hat for Team Fortress 2, the Adult Swim web site revealed today. Yes, of course it was a hat.
The Adult Swim web site is giving away the "free limited-edition" Robot Chicken hat to anyone who signs up for the network's newsletter, which nets you a Steam promo code good for one brand new digital accessory.
A bit... anticlimactic, eh? Don't worry, Adult Swim says, because "this ain't the last you'll hear from Adult Swim and Valve." The partnership opens a new world of Team Fortress 2 headgear opportunities, including – and we're just spitballing here – a Dr. Steve Brule wig for the Medic, a Delocated ski mask for the Spy and maybe even a Van Dyke inspired by Aqua Teen Hunger Force's Frylock.
In more exciting news, Valve released "Meet The Pyro" earlier today.