What is a command you accidentally taught your pet?
My goldendoodle puppy doesn't ever want to come back inside. I told my beagle "go get your sister" as I tried rounding up the puppy. Now when I say "go get your sister" the beagle runs to the puppy and baits her into chasing him into the house.
One of mine would headbutt me right in the nose/lips (like "yes human kiss head here") if I did the "smooch smooch" noise, every time. Pretty hard too in his younger years!