The IOCCC Flight Simulator

"The IOCCC Flight Simulator was the winning entry in the 1998 International Obfuscated C Code Contest. It is a flight simulator in under 2 kilobytes of code, complete with relatively accurate 6-degree-of-freedom dynamics, loadable wireframe scenery, and a small instrument panel.

IOCCC Flight Simulator runs on Unix-like systems with X Windows. As per contest rules, it is in the public domain."

Here's the source code: