Want to think about the failure modes on that. I had a key fail on my old 1999 Nissan Maxima. It would no longer authenticate to the immobilizer to allow the motor to run (it cuts off either spark or fuel-- can't recall which). That was a pain and required a tow, but at least it wasn't smelly, too.
The smelly part would be useful when the car is towed against the owner's consent though. It should be law to at least attempt to contact the owner and give them 15 minutes before even touching a car that isn't yours. Since the law hasn't enacted this, fart spray (and maybe some sticky goo) would help delay towing companies while simultaneously contacting the owner via some kind of app.
Why? How do 3min load/unload zones work then? This grace period would put a lower bound on parking times and convert “no parking” areas to “at least 15 minutes”.
