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I don't think that wrist-key is an extreme (never seen it actually, but I still think this solution is a cautious one).

For me an extreme measure would be to modify my motherboard in a way that I could connect RAM to my wrist and tear it away when necessary.

Now that would be interesting: have your RAM strapped to your wrist and connected to your Mobo by a breakaway cable.

Bonus points if they cut it when the tackle you because they thought it was a deadman switch, like mentioned in the link.