Kids, this is the reason your mom told you never to wave or stick your arm out of a car window:
A 20-year-old man is stable after undergoing surgery on his arm that was partially severed as he waved out a car window at two girls in Western Australia.
He was a passenger in a Nissan utility that drove past two girls washing their vehicle at a car wash in Bunbury, south of Perth, last night, police said today.
"He put his arm out the window and waved at the girls as the Nissan made a right hand turn at the intersection, and was struck by a Toyota Hi-Lux twin-cab vehicle,'' a police statement said.
"His left arm was partially severed and doctors believe the limb may need to be amputated.''