Gaming glitches

Since the dawn of the video game era, some of us have spent our time trying to find glitches in games that allow silly, or unexpected things to happen. Others don't go out of their way to break game engines. They just stumble into doing it.

Here's a look at gaming glitches. Specifically Vice City, but it details others, like the glitch in a version of Asteroids that allowed you to sit in a little pocket of invulnerability.

What is the best glitch you've ever found in a game?