I wrote a computer game when I was in a US History class in high school. The Blue And The Gray: a Civil War strategy game with combat animations, cut-scenes, and twelve types of units. It's a turn-based strategy game that's similar to Advance Wars -- but you can also answer questions from US History to make your units more powerful.
Another computer game I wrote in high school. For a biology class we had learned about acids and bases. In this game, you have to furiously click molecules to keep your blood pH balanced, in order to keep yourself alive.
On vacation in 2006, right before I left to study engineering, I came up with an idea to use scrap wood to build some fun golf-ball ramps with my brothers. This one was well-calibrated -- see the video here.
My brothers and I were hiking in northern Idaho, and we saw a natural whirlpool in a stream. I've never again seen this happen in the wild. see the video here
I had fun writing this paper in middle school. Not the way you're supposed to write about art.
What is this file named MUTANT.MOV? Then I remembered: The Attack Of The Mutant Teddy Bear. I made this on my own in 2000... each frame drawn in the Vista Middle School computer lab. See the video here.