I remember growing up and hearing a story similar too this one. I lived in a rural area and when the neighboring kids got together for a Dwayo Hunting Party we were always warned to watch out for Hook Arm.
The story I remember was told of a young couple who were parked in an Lover’s Lane. A burly looking man came up to their steamy windows and was seen peering in at them. The young man started the car and drove off as fast as he could. On arrival at a safer spot, he found something the man had left behind..his hook arm on the car window.