This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Isn't this usually called Earworm? You hear a song and it gets stuck in your head, and you keep humming it. SOmeone else catches it, and they start humming it, and for some reason, you (most people actually) stop at that point. It's like a computer worm. It goes from ear to head to mouth to ear..