Dutch pranksters in Amsterdam have dumped dozens of the tiny two-seater cars into the city's waterways.
And now police fear the bizarre trend will spread to the UK and the rest of Europe.
Eco-friendly Smart cars are small enough to be picked up by just a few people and dumped into the Dutch capital's canals.
One Smart sales worker said: "We're not supposed to talk about this because the police don't want the craze to spread but we've had quite a few drowned cars returned to us."
Photo shows a crane pulling a Smart car out of an Amsterdam canal.
Link