Toll to Pee

A little old lady was walking down the street dragging two large plastic rubbish bags behind her. One of the bags was ripped and every once in a while a £20 note fell out onto the pavement.
Noticing this, a policeman stopped her, and said, “Ma’am, there are £20 notes falling out of that bag.”
“Oh, really? Darn it!” said the little old lady. “I’d better go back and see if I can find them. Thanks for telling me officer.
“Well, now, not so fast,” said the cop. “ Where did you get all that money? You didn’t steal it, did you?”
“Oh, no, no”, said the old lady. “You see, my back garden is right next to a Golf course. A lot of Golfers come and pee through a knot hole in my fence,right into my flower garden. It used to really piss me off. Kills the flowers, you know. Then I thought, ‘why not make the best of it?’
So, now, I stand behind the fence by the knot hole, real quiet, with my hedge clippers. Every time some guy sticks his thing through my fence, I surprise him, grab hold of it and say, ‘O.K., buddy! Give me £20, or off it comes.’ ”
“Well, that seems only fair,” said the cop, laughing. “OK. Good luck!
Oh, by the way, what’s in the other bag?”
“Not everybody pays.”