Ear-worm it is something amazing, sometimes stay with you few days or so. Yesterday when I was passing by an advertisement it was Kylie Minoque on it, but I have no idea what the the poster was about. That moment it was just like a light switched on in my brain I just had to sing: La, la, la, la, la, la, la, la.. from the song "I just can't get you out of my head" .