I realized that I accidentally trained my horse to be cleaner in his stall. I feed him myself and in the morning I am a little lazy so I would clean his stall but just put all the poop and pee right outside of his stall in his run (he doesn't have full time access to it) until I fed him at night. After a while he started to just poop in one spot closest to where I would normally put his poop and now his stall is very clean in his stall. He has always peed in one spot and now that the poop is in one pile it is so much easier to clean. It's awesome.
Has anyone else "accidentally" taught a horse to do something good?