I had a mate in NI get into trouble; he was a Snatch driver (lightly armoured landrover) and one of his windscreen washer jets was twisted around, so that when he wanted a jet of screen wash, the screen wash shot outwards and to the left, instead of at his windscreen.
For a laugh, while stopped at some traffic lights, he activated the screen wash lever and it hit some bloke who looked like Grizzly Adams. Grizzly Adams looked up and saw the guy on top cover and thought he'd just been spat at by him and hurled a load of abuse at the guy (who didn't have a clue what was going on).
Later, my mate did the same trick to some woman, but unfortunately the screen wash jet hit her in the eye and she ended up in accident and emergency, and my mate got into a whole load of trouble.
Screenwash in your eyes isn't good.