5. Sam - Supernatural
I know, I know, the Winchester brothers have a tendency to die a lot. But I'm talking about the first time he died. When Yellow Eyes was playing Hunger Games with a bunch of Damien-type kids, and they started picking each other off one by one. He and the army guy had sort of come to an understanding, and you thought they were all in the clear. After all, Dean had just gotten there, and nothing bad can happen to Sam when his big brother's around, right? Wrong. Sam was shot and killed. He bled out on the grass while Dean, who had been conditioned from childhood that his number one job in life was to look out for Sammy, had to stand by helplessly. Of course, Dean then went on to sell his soul to the devil in exchange for Sam's life, so all's well that ends well, but I think we were all pretty shaken up at the idea that the Winchester brothers were in fact mortal.