YOU ARE A SKELETON
You had a good life. You went to your eternal rest. Now many years have passed and just your bones remain, nice and clean, peaceful and quiet. Then someone comes along and animates you! You don't even have a smile or a warm hand to hold - just crunchy bones mysteriously held together. How can someone kill you? There's no brain to mush, no heart to stab. Maybe the best someone could do is mash the bones into dust, or try to take on whoever has animated you. You don't really care, you're just a collection of bones.
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Skeletons have always held a fascination for people. The thought that this was all that remained of us after we died, and the thought that those bones might be able to move and hurt us, is very compelling. How can you harm a creature made of only bone?
Skeletons don't seem to be the main villans in any movies either, they're just the peons, being used to terrorize people.
...that's very appropriate, actually! <img src="/images/graemlins/wink.gif" alt="" />