A girl had devised a device to cause any car that passed in front of her house to suddenly break down but couldn't find any practical way to profit from it. So, thinking clearly, she set up the device, and as the cars passed the house and broke down, she'd offer the man in the car a place to stay for the night. Then as soon as the man was asleep, he'd be jarred awake by her with his penis in her mouth, and she'd hold a sign up saying "$50 or I'll bite hard!".
Of course usually the guy would pay and she'd let him go. Well one day a Yankee broke down, and had to stay the night. Sure enough, he felt something between his legs at night, and there she is with him in her mouth and holding the sign "$50 or I'll bite."
The Yankee just smiled and said "$100 or I'll piss!"