How do I get my kids to scoop the doggy doo?

I love this suggestion, given to me by a friend: "We have two dogs and a big yard, and no matter how much nagging I do, my kids never seem to get around to scooping--or they do, but they rush it and miss half of what's out there. (Obviously, we don't get around to it all that often!) I even bought a long-handled scooper so they don't have to bend over or get their hands dirty, but it's still a thankless job that's never done well, if at all.

Yesterday, however, I walked into the family room while they were watching TV and plunked down twenty $1 bills. I said, 'Here's twenty bucks, just for you guys. Go outside and scoop the poop. When you're done, I'm going to go out and look around. For every poop I find, I'm deducting a dollar. Whatever's left when I'm finished, you get to keep.'"

Twenty dollars may seem a little steep for a job that takes just twenty minutes, but in their case my friend said it was money well spent. Apparently, the kids filled almost half of a paper grocery bag with doggy doo, missing only one that their mother could find. Nineteen bucks for a poop-free yard? I'd say that was priceless.