Perhaps the most unlikely witness to Saturday morning's huge earthquake in Chile: former American Idol finalist Elliott Yamin.He was, after all, in the city of Vina del Mar, performing for a music festival when the magnitude-8.8 earthquake struck. He's pretty far from the epicenter: Concepcion, the second biggest city, was closest to it, and Vina del Mar is quite a far trip from the country's capital, Santiago. Still, the tremors freaked him out, to put things loosely.