I'd have to say that a death by drowning scares me alot. I've been through almost buying the farm that way once and don't want a repeat performance. To die alone is my greatest fear. I've stories about people who died alone and no one comes to check on them till their house is either about to be condemned or the stinch begins to bother the neighborhood.

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Deep into that darkness peering,
long I stood there, wondering, fearing,
Doubting, dreaming dreams
no mortal ever dreamed before.