Some people I once knew have a pet crow who started out being taught to poop outside from above the front yard and over time this turned this into a habit of pooping on any stranger who came to the front door, most comedically government workers who don’t hold it against those friends because they assume he’s a wild crow. My pet trash panda doggo, herself a friend of the crow, accidentally learned to identify or seek out bird poop by scent as a result of this.