We just started to play Tears of Pearls by Savage Garden in Amarok just when the windows in KDE environment started to dance with the rhythm, we were stunned and first thought that it was either some feature of Amarok or of the some kind of desktop effect. My friend quickly recorded a video with his Corby Mate, have a look at it:
The thing was, just when the song started the mouse reached the top left corner of the screen which is a gesture for showing all the windows in the desktop. The mouse was positioned in such a way that the windows were displayed and then again going away in a rhythmic pattern. We really had a very good laugh.