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In an analogous situation the approach taken is the following form of social engineering:

EDIT: As Isemi noted in the comments, "some urinals provide painted flies or plastic soccer balls or even miniature waterwheels to induce patrons to aim properly and minimize urine spills".

Thus:

1. Provide some decoy or other point of interest that the monkeys would prefer, rather than your roof.
2. The kids will then throw rocks at monkeys which are not on your roof.

So its a "fly" provided to both groups of pests.