Dear Neighbor

If our neighborhood had a community bulletin board I would be posting the following:

Will the neighbor who misplaced the clear plastic sandwich bag with the brown cylindrical remains of a canines' digested meal on my front door step, please come and claim them immediately.

Yup you got it, last night someone left a bag of dog poo on my front step. What is with these people?
I do try to be responsible. I bring plastic bags on our dog walks. I have even ordered some "poop-freeze" for when Hero's in dairy queen mode. My dogs do NOT roam the neighborhood unattended (unlike some others), and my dogs are NOT nuisance barkers.
Now, I do admit that my children may be careless with their clean-up when they walk the dogs (their bedrooms prove that cleaning up is not their strong suit). But there are at least 5 other children ages 8-14, who regularly walk their dogs (with no bag in sight). And this is a neighborhood where the dog owners far exceed those without dogs. So why do I warrant this special delivery?
Sure, it may have been kids pulling a prank; but the way it was so cleanly and perfectly placed in the plastic bag and then on the stoop makes me wonder. - Again, kids are not known for being meticulous.
Not helping my Happiness Quotient people!