Mine cribs, he lives out 24/7 and does it after he eats his feed (sounds stupid but due to a missing tooth and the feed gets stuck in the gap and falls out when he cribs) bought him knowing he did it. He has a rail in his shelter so he can do it on that as he pleases. Only problem I've come...
Cantering along the beach approaching an outlet from the sea. Horse goes to jump and changes his mind just before and spins, I land face first in the sea. On seeing that if the water was safe for me to go in he trotted in beside me splashing me. And it was all on video :D