In 2005, Microsoft made a "Jump In" ad for their Xbox 360 console that never aired. The ad, deemed too controversial, showed commuters on a subway platform playing "shoot 'em up" with their fingers (Bang!).
Like many viral things, the ad has recently gone 'round the web again, so here it is for all of you who haven't seen it: Hit play or go to Link [YouTube]
And if you like that, check out the casting call for the banned Xbox 360 shoot out ad (which is actually better than the actual ad!):
This commercial has a joking attitude. Nobody was actually serious (as shown by the person in the car) about it. They were using their fingers guys, come on now.
Also, I play first person shooter games all the time. I would honestly be afraid to pick up any actual gun. They're just not my thing, I don't like them.
Really, the people that play first person shooters and actually think about doing violent things that are sometimes shown in those games are messed up in the head.