This might have happened to some of you using Windows. If you double click on the empty gray area of the WIndows Task Manager goes from the normal mode:

( Source; Wikimedia )

To the "Tiny footprint" mode:

( Source: ImageShack )

To me, having such a feature that can be turned on accidentally like that without having any note of it in the application itself doesn’t seem that good of an idea to me. Of course, I should have checked Microsoft’s Help and Support much earlier.