My cousin's best friend's friend swears down this is true and happened to his best friend.
He was driving along the road and he heard a tapping on the roof "TAP TAP.... TAP TAP.... TAP TAP". Then there are a series of events that involved a hitchhiker and a gas-stop (they were in america). And they heard the tapping again.

Suddenly they see the police are following them and they're speaking on the loud speaker saying "PULL OVER", so he pulls over, and the police, sorry, I mean cops, the cops say "GET OUT THE CAR, WALK TO ME, AND DONT LOOK BACK WHATEVER YOU DO", and the cop had his gun out too. So he got out the car, and walked to the police officer holding the gun, and didn't look back.

But then he did look back, and there was a man on the roof with the gas station attendent's head on a stick. He was dead.
( G/PP 💩💩💩💩💩&#128, Thu 29 Aug 2013, 9:55, Reply)