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There was a (fairly rubbish) kickstarter campaign for a (weedy) chain lock which had a sheath made of chainsaw protection material which would entangle any power tool you use to cut it. I've always thought that was a good idea and could be taken further by adding steel cable to the sheath so that you can't easily just cut it off with scissors.
I like that idea of a bike lock that if cut releases a smell so bad it makes you vomit.