Tyler Lee over at Ubergizmo pointed out an interesting OS X bug that affects the way that the Launchpad window is displayed. It's an annoying bug, but strangely enough it's also quite beautiful.
The bug doesn't apply the blur effect when Launchpad is opened -- instead, it applies the crystallize effect which gives your app icons a nice "stained glass" appearance. It doesn't last for long, and the bug apparently isn't hitting many Macs. But it is kinda cool.
If you see the bug in action and happen to be able to nab a screenshot, let us know in the comments.