Losing my arms.
Don't know why but that particular tragedy freaks me the hell out.
Watching Daredevil is kinda making me afraid of being blind, just because the show makes me think about what being blind is like. And that scares me too. Especially since I'd have none of Matt Murdock's other skills.
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Have you ever read Johnny Got His Gun? Fucking terrifying book. It's about a World War 1 soldier who gets hit by a mortar. He loses both arms, both legs, his mouth, tongue, eyes, nose and ears. It's all about how he's a mind trapped in a useless pile of flesh. Terrifying.