They can get into some of the darndest messes can't they? A couple of weeks ago my mare was tied up in the barn. She wiggled around and pulled a step stool to her and was kicking it with her front foot kind of playfully. Before I could take it away she got her foot in the hole. She just picked it up and shook it off and I moved it. I didn't know it was any big deal but my trainer said that some horses would have paniced and sat back and she did good. I'm constantly having to watch her though. She's worse than a toddler.
If there is a way for a horse to get into trouble, they will do it. They don't even need anything in their stall to get hurt. They just find a way LOL. But God Bless horses!!!