Since it keeps getting brought up,
www.lifegem.com . Terribly expensive, though. Must have caught on, because I'm pretty they've raised their prices considerably since I last looked. It's too bad, because I'd love to have that done with me.
What I'd really love in a less-than-serious way is to have my body given to a taxidermist. Stuff me, stick me in the closet, and trot out Crazy Uncle Monkey King every Halloween. No seriously, I love the thought of making my descendants the coolest kids on the block every October. Stuffed dead body for a Halloween decoration. How can that not be awesome? Assuming it's treated so that it doesn't smell, of course.
Obviously I'm not too hung up on what's done with me after I die. Once I'm dead, I am no longer using my body, so as far as I'm concerned the living should put it to some sort of practical use. At the very least, plant a tree directly over my grave so I fertilize something other than weeds. Or donate me to forensic researchers, and so on.
Funerals are for the living, so people shouldn't get too hung up on the body. Unless your soul is inside it, it really shouldn't matter what happens to it.
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