Hmm... whoever made that has a raging hardon for console games, and Valve. (Of course, I agree Valve is pretty great.)
A WoW weapon could be on the list, given how many people have played/still play the game. Probably something from the original game, so ... Thunderfury? I mean, come on. Who hasn't seen:
[1. General] [SomeAsshole]: [Thunderfury, Blessed Blade of the Windseeker]
[1. General] [SomeAsshole]: [Thunderfury, Blessed Blade of the Windseeker]
[1. General] [SomeAsshole]: [Thunderfury, Blessed Blade of the Windseeker]
[1. General] [SomeAsshole]: [Thunderfury, Blessed Blade of the Windseeker]
[1. General] [SomeAsshole]: [Thunderfury, Blessed Blade of the Windseeker]
Plus all the guys standing around with it out in Ironforge/Orgrimmar.