A  little  old lady is walking down the street, dragging two
plastic garbage  bags  with her, one in each hand. There's a hole
in one of the bags, and  every once in a while a $20 bill is
flying out of it onto the pavement.
         
  Noticing this, a policeman stops her...."Ma'am, there are $20
bills falling out of that bag..."  "Damn!" says the little old lady....."I'd
better go back and see if I can still find some. Thanks for the warning!"
         
   "Well, now, not so fast," says the cop.
"How did you get all that money?" " Did you steal it?"
         
   "Oh,  no",  says the little old lady. "You see, my back yard
backs up to the  parking lot of the football stadium.Each time there's a
game, a lot of fans come and pee in the bushes, right into my flower beds!"
"So,  I  go  and  stand  behind  the bushes with a big hedge
clipper, and each time  someone  sticks  his little thingie through the
bushes, I say: $20 or off it comes!"

  "Hey, not a bad idea!" laughs the cop."OK, good luck! By the
way, what's in the other bag?"
         
         "Well",  says  the  little old lady, "not all of them pay up"....