10. Ashton Kutcher

Trucker hats. He gave us fucking trucker hats. We will never be able to forget that, and it's only being made worse by shifting gears to this new, perpetually shirtless-Jesus motif (made possible by the ratings whores that bring you Two and a Half Men). So now begs the question: what obnoxious trend will Ashton Kutcher be responsible for next? Fur man-vests?