You know that horse's and horse riding are highly risky sports and also came with health risk's - the amount of horse poop in London as it grew was a major health issue.
A parked car doesn't suddenly get spooked and lash out with its hooves does it.
A parked car doesn't suddenly get spooked and lash out with its hooves does it.
The banana skin (and the inevitable slip that followed) was a euphemism for slipping on horse manure in the street.