Everyone remembers the arcade classic "Breakout", right? Well, I've found an on-line version (flash-based) that quickly devolves into insanity! Surprisingly, it's rather fun. (Credits to Reddit for the link.)
Here's the link to the game. You start out with one ball, but each time you hit a pixel up top, more balls fall. After a few seconds, you'll start getting cascades of balls, and before long the entire screen is nothing but mayhem! Most games are over pretty quickly, once things really get going.
To start a new game, re-load the page. Give it a shot!
Adam