Check out this game from a Georgia Tech student and his girlfriend built in just one day: http://www.k2xl.com/games/boomshine/
How to play: the screen is filled with a varying number of colorful dots. With a click of your mouse, you create an orb, which expands, ensnaring the dots. When your orb hits a dot, that dot expands and swallows up other dots. The goal is to create a chain reaction, by which you encase as many colored dots as possible.
As you move up in levels, you must join up more and more of the infuriating dots until at last you throw your stinking computer out the window. I can't get past level 12 and it's driving me crazy.