A Little Old Lady

LITTLE OLD LADY
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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.
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Noticing this, a policeman stops her.... "Ma'am, there are $20 bills falling out of that bag."
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"Damn!" says the little old lady....."I'd better go back and see if I can still find them. Thanks for the warning!"
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"Well, now, not so fast," says the cop. "How did you get all that money? Did you steal it?"
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"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!
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So, I go and stand behind the bushes with a big hedge clipper, and each time someone sticks his little winkie through the bushes, I say, $20 or off it comes!"
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"Hey, not a bad idea!" laughs the cop. "OK, good luck! By the way, what's in the other bag?"
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"Well", says the little old lady, "Some of them don't believe me."