Chopper Bike Playing Cards In The Spokes
A clothes peg, a card, and instant motorbike.
Peg a playing card against the spokes and your bike made a noise. That was the whole technology.
Two cards was louder. Four cards slowed you down. There was a genuine optimum and every street had worked it out.
It destroyed the cards and eventually the spokes. Nobody has ever cared less about a consequence.
Cost back then
Free, if you had cards
Goes for now
Still free, still works
