Trying to find an old flash (maybe Java?) game I used to play on coffeebreakarcade called Bump. (Or at least I'm pretty sure it was called that.) It disappeared off the site years ago and I haven't seen it anywhere since. Your goal is to get the character safely to the exit of the levels by rotating pipes and avoiding hazardous walls. The character can bump off non-hazardous walls, hence the name.
Also, I was looking at Insaniquarium because I also remember playing that on the site, but apparently PopCap now sells the game for $10. What happened to the free online version? Is that still around somewhere?