First off, http://www.tsmusicbox.com/ The Timesplitters Music Box. It has all the music from the first 3 Timesplitters games, which are great games with awesome music. If you haven't played them, go buy them and do so if you like shooters. The first is straight up arcade style FPS action, with basically no storyline beyond what is described on the box. TS2 introduces an element of story, but it's brief and the main focus is the action. Timesplitters: Future Perfect is a game with a full and often hilarious story. All of the games span a number of eras, from 1930s gangster era to 2400 or so with sci-fi weapons. If you like FPS games, you're doing yourself a HUGE disservice if you haven't played the games.

Also, what other game will give you the opportunity to play in multiplayer as an ANGRY, GUN TOTING MONKEY?!?! Even if you don't play the games, get the music because it is great.

Skill. Ability. Aim. Mouse 1. Intelligence. W
http://www.youtube.com/watch?v=B170dwf7Z7I
Meet the Mouse 1 + W pyro. And by that, I mean the only keys he has on his mouse and keyboard are W and Mouse 1. All other buttons have been removed. I suck at pyro, perhaps I don't Mouse 1+W enough.

Similarly, meet the spychecker
http://www.youtube.com/watch?v=nR04zoJurSI
He checks for spies.