Shamelessly stolen from a Canadian blog...
Two men are driving through Saskatchewan when they get pulled over by a Mountie. The Mountie walks up to the car and taps on the window with his nightstick. The driver rolls down the window and "WHACK", the Mountie smacks him in the head with the stick. The driver yells, "What the hell was that for?" The Mountie says, "You're in Saskatchewan son. When we pull you over, you better have your license ready when we get to your car." The quivering driver says, "I'm sorry, Officer, I'm not from around here."
The Mountie runs a check on the guy's license, and he's clean. He gives the guy his license back and walks around to the passenger side and taps on the window. The puzzled passenger rolls down his window and "WHACK", the Mountie smacks him with the nightstick too. The passenger yells, "What'd you do that for?" The Mountie says, "Just making your wish come true." The passenger says, "Huh?" The Mountie says, "I know that two miles down the road you're gonna say, "I wish that asshole would've tried that shit with me."