Here's what you do -
You clean up all the used diapers in your yard except one. The exercise will do you good.
A little lighter fluid on the diaper left over - set on fire on their front door mat (when they are home) ring the door and run.
You feel better because harmonic balance is restored - you cleaned up the diapers - they have a little clean up too. They don't know it was you - you know who it was.
Hopefully they will recognize the diaper as their own - If anybody asks - you saw one of their own kids messing with something on the porch.
