Petty revenge

This is from my old childhood, around about ~7 years ago, I used to live in a decently sized cul-de-sack (about ~20 houses along a straight, then ~20 houses around an island at the end).  Me and my family lived around the island, with a decently looking front garden; in fact, there was this untold rule about how everyone had to have the best and most intricate gardens.

Well, one day, my mom steps outside for work (and to take me to school) at 07:00 and there's a gigantic (but thin) turd just lying there, right in the middle of the garden.  My mom was pretty pissed, but she cleaned it up.  About one week later, again, my mom stepped outside, and low and behold, there's another pile of shit sitting there innocently, in the center of the garden.  At this point, we think there is a cat gettin' up to no good...

After it happening twice, we decided to figure out who responsible for this, so we set up these old security cameras we used when my sister was being heavily bullied at school (they used to turn up on our doorstep, police wouldn't do anything, but we never took them down).  We wait patiently for the perpetrator to strike, however, there is a silence for a few weeks and we forget all about it.  Not too long after, a great big dump, this time, right on the edge of the grass, (outside of the camera's field of view); but it wasn't a failure, we rewound the tapes and looked for any animals, a few cats had passed our lawn, and a white fluffy dog strolls up to our front door, and goes away.  We assume that this is our most likely suspect, so we mark the time it happened (about 10 to 6).  Now, being in a small cul-de-sack, we were pretty sure that this is Wendy's daughters dog (she received it as a present).

Armed with our newly held information, we aim the cameras at half of the drive, and half of the garden.  We left it like that for a while, and sure enough, the culprit struck again (bang in the center this time), all day I was just waiting to get back home from school so I could find this cuprate once and for all!  Fast forward, I arrive home, and we dart into the garage to watch the security tapes, skip to 10 to 6, and sure enough, the dog is aimlessly wandering around the street, walks up to our house, and sniffs a patch of grass; the dog then proceeded to lift its tail, and squeeze one out without a care in the world.  Once the deed was complete, it ran off to the left out of view.  BINGO!  We get curious to see how often this is happening, so we look at the mornings of other days, and fairly consistently someone in Wendy's family is letting this dog out for it to have a crap on other peoples' lawns.

We decide this isn't enough, we want to see them release the dog, so one morning, we got up early, and sat in the car watching their house.  Just like clockwork, the dog was released at 10 to 6, and it was Wendy's husband whom released the dog; we watch it pick out a lawn at seemingly random, take a dump, and clear off.  That's about it, we had enough of this...  So when we come home on at about 3:30, we scoop the evidence with a plastic bag, walk over to their house, and smear this dog's poop into their doormat (which is also brown, so it helps blend in), so that upon them returning home, they unknowingly smear the evidence onto the bottom of their shoes, and proceed to walk it through the house (we know they don't take their shoes off inside, and that they have a relatively new cream carpet; imagine trying to get dog shit out of that, and oh, the smell!).

Sure enough, the dog was never released into the street in the morning again!  I really do wish that we could've heard what it done to their gorgeous cream carpet!

TL;DR: familly lets their dog out to poop on other lawns, we position the poop on their doormat, so they unknowingly walk dog feces through their house, and on their cream carpet.