Here's a challenge: listen through this fantastic rendition of the original Tetris theme by Smooth McGroove, and see if you don't end up with the song stuck in your head.
Bet you can't do it. OK, well, some of you will. Still, it's a catchy-as-hell acapella, right? Great work as always, McGroove.
And here's the original theme, in case you want to compare:
Tetris - Theme 'A' Acapella [Smooth McGroove]