Transponder Immobiliser

[BBROWN1664]

[quote author=slappy link=topic=23991.msg278527#msg278527 date=1523952225]
Not too big an explosion though, just enough to rip their balls off and totally shred their rectum.

You appear to have thought about it in slightly more graphic detail than what was actually necessary.  :lol

I think an Ejector seat would work well too, ideally set off as they enter a bridge (loads of those around London) - plus no explosion, so you wont have to scrub off remnants of balls and rectum from your Head (motors head) !!
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I wouldn't want the bike back after its been stolen so no need to worry about scraping body parts off the remains of the bike. It might prevent the bike being nabbed in the first place though.

That said, how many times in the past, when airbags were a new idea, did we hear about airbags going off accidentally. I am not sure I would want to ride a bike with the "explosive seat" but it is something we could fit once the bike is in the garage and locked away for the night.