In reply to Reach>Talent:
This happens with annoying frequency, and it's triggered by Heart and Radio 1 at work repeatedly battering my senses with catchy, trashy tunes. The effects often linger for hours, sometimes even tormenting me during sleep.
Latest earworms I've suffered:
Kiss You - One Direction:
Call Me Maybe - Carly Rae Jepsen
Maroon 5 - Payphone
Bastards