A long time ago, I was playing Far Cry. Console was opened. Then all of a sudden IRC chat messages from the IRC client I was running in the background would appear in-game, with fronts and effects (shadows) from the game. shrugs
I messed something up about it, and must have been pulling from the wrong graphics memory, and noticed That the brown wood didn't have a swirl pattern but had what looked like text in it?
After staring a bit closer, I noticed it was the text that was written to the console in visual studio, I had somehow brought that graphics buffer in to use as my "swirl pattern". I had to sit back and think a bit about how data on your computer isn't always as safe as you think sometimes after that...
I've seen many bits of cahced browser viewport textures when writing shaders and making mistakes. I've been wanting to create something procedurally from it somehow ever since I encountered it.