I told this one a while back on another thread, but I'll tell it again.
My trainer has a big off-track thoroughbred gelding (Justin) who loves to jump. Like, really
loves to jump. She can point him at a five-foot fence and he'll willingly take it from a standstill.
He must have gotten bored one night, because they went out for morning feeding and found that he had drug his water trough into the middle of the paddock... to jump it! Here was Justin, galloping around and jumping his water trough.