You know the ones I mean. You heard it once, you hum it, you sing it in the street, you listen to it again, you put it on repeat then BAM you have caught the catchy song disease, you are playing it on repeat, you are singing it as you go to sleep then DREAMING about it, and waking up with it in your head, and you just want to listen to it habitually 24-7.

Luckily, the condition doesn't last too long, althogh in rare cases a second win can occur upon rediscovery.

Mine -

White Town - Your Woman
Eels - Novocaine for the soul.
Britney Spears - Hit Me Baby One More Time
Babylon Zoo - Spaceman (the first 20 seconds or so)
Lilies - Nanny In Manhattan

and more recently

The Hives - Main Offender
Yeah Yeah Yeahs - Bang
Bureau De Change - Fashun
Arcade Fire - Neighbourhood 1
Beyonce - Crazy In Love
Patrick Wolf - Bloodbeat
Final Fantasy - This is the Dream of Win and Regine