I mentioned this in my introduction thread, might as well post it here.
It's a cartoony adventure/action game I worked in 2007, tentatively titled Bounce's Adventures. You control a ball that seems to defy the laws of thermodynamics, trying to squish your enemies and escape to the next zone. In theory, anyway. Unlike some other stuff I have worked on, it was not ruined by lack of motivation, massive bugs, or running out of ideas: I made the mistake of using Python without learning OOP in Python, which means that the code quickly became an unmaintainable mess. I managed to add one moving object (a badly drawn mouse that lives in the sewer...) that didn't even affect the player before giving up.
I only finished the intro scene, so you get to fall down into the sewer and instead find a mysterious underground base which contains a teleporter to The Internet (never got to that part). It's more of a physics demo due to the lack of gameplay, and the horrible graphics (at the time I had only been using the GIMP for 1 year).
If the crap floating in the sewer seems a bit too elastic, that's because I was increasing the bounciness of it just for testing purposes. The physics have some minor bugs, and it's possible to get bouncing so fast across the level that you can't stop.
The physics are pretty cool though (slightly buggy), and the levels are all loaded from text files. Also, I was 14 at the time, and this was my second game ever, so considering that it's not as horrible.
You need Python and Pygame to run it. I suggest not looking at the code though, it will make you want to kill me.