My money's on Disturbed's brutal rape, torture and dismemberment of 'Shout' by Tears For Fears.

The bit where he goes "As cold as ice (grrrrogggle ICE ICE BABY)" like a spastic throwing a tantrum is the lowest point, but to be fair it flatlines pretty low all the way through. And I've had to hear it twice in the last two days, which is 2 times more than anyone should have to hear anything this awful in their entire lives. Urgh.