Why do some people leave their cars windshield wiper up when they leave the parking lot?
When they park and shut off their car, their wipers are mid-wipe and they're too lazy to turn their keys and let them go back down.
Weather is the only reason I've heard of. If it's cold, usually it's so the wipers don't ice to the car. If it's hot or muggy, sometimes you get more pollen debris under them.
It IS usually because they're too idle to switch the wipers off properly, just turn the ignition straight off and the wipers stop where they are. Actually, sometimes it is done deliberately as someone has already said. Where I park at home the windscreen collects pollen, dust, bits of debris etc from trees, especially if it's windy. If I think about it, I park the wipers up the screen so the blades don't collect so much crud that has to be removed.
