Bullet Philharmonic Orchestra
Here's something that guarantees at least three minutes (give or take, depending on your taste in music) of fun: Bullet Philharmonic Orchestra. It's an ultra-simple, free, downloadable (PC only), barebones shoot-'em-up-inspired game with a simple concept: dodge the bullets. The game itself was designed with two things in mind: mindless entertainment, and improving one's dodging skill in those crazy bullet-spraying shmups (both of which it achieves).
After installation, put a couple of your favorite music files into the 'music' folder where you installed the game, then start it up. The game will play random files from that folder and, in tune with the music, will generate semi-random patterns of bullet spray from the top of the screen. You, the red dot at the bottom of the screen, must avoid getting hit by this onslaught as long as possible. In a way it's kind of like Rez, except you get to choose the music, and it also has been stripped away of any features that one might call beautiful.
Once the game is started, press [Z] to begin and use the arrow keys to control your dot. Anytime a bullet strays within the green ring surrounding your dot, white sparks will fly out, meaning you were 'buzzed'. When a bullet hits that red dot, sparks fly out. In other words, you would be dead in a real shooter. That's all there is to it. Get hit less, earn more points. For more challenging gameplay, use songs with high tempos, or anything one might listen to before playing a sports game.
Analysis: At just over one megabyte, this is a downloadable that even our dial-up friends can enjoy (though unfortunately our Mac and Linux friends will have to sit out for this one). My only real complaint is that every once in a while, the game won't recognize an MP3 file you give it, and while this is rare, it's very annoying. The game should work fine with any WAV or MIDI file, however. Other than that, the only thing I'd like to see is the ability to specify a music folder to get files from, rather than have to move the music to a particular folder; a minor qualm with an otherwise fantastic distraction. Give it a try.
Download the free full version