So, i was messing around in Super Mario Odyssey. I saw in my Nintendo Switch news feed that there is a secret in Bowser's kingdom, so i decided to go there to check it out. It was pretty cool, but then i just started messing around with a Pokio (In case you didn't know, a Pokio is a bird who can use it's beak to climb walls.) after a bit, i found a neat little glitch that allows Mario to clip inside a Stairface Ogre.
How to do: You have to poke your beak into him, right as he slams down his stairs. If you're lucky, you should get stuck between his stairs and his face. From there, you should be able to just walk into him. This will cause him to moon-walk in a circle.
I think what is happening is that the game thinks you are behind him, which causes him to go backwards. However, because you're inside of him, you are going backwards with him, which causes him to go backwards infinitely.
Final note, i'm not planning on posting anything else. I just put this here cause i think i'm the first person to find this, and it's pretty cool.