We once had an awesome IE bug where a style applied to a spinner made the whole page rotate. QA thought it was a prank.
https://www.google.com/search?q=Double+Asteroid+Redirection+...
First off, I thought that it would be cool if they rotated a proportion of 360 degrees equal to the proportion of the change in orbital time period to the previous orbital time period of the asteroid. Then I realized that it changed by around 5%, so that would be 360 * 0.05 = 18 degrees. Not really readable.
That's 2 minutes that I'll never get back, but it's left me amused for some reason. Heh.