One of the old broodmares at the barn I board at got herself trapped in one of the runs of the old goat shed. Best guess is she went in through an unlocked gate, up one of the runs, through the shed (now storing misc tools/junk) and out into a locked run where she became trapped. As you can see by the pictures it is too narrow for her to turn around in and she was unable to back through the path she used to enter. I was able to free her easily enough and she wasn't hurt at all, just a bit confused. I figure she was in there less tahn 2hrs since I saw her out in the pasture when I arrived and found her trapped just as I finished my 2hr ride.
Anyway, have your horses ever done anything silly like this?
I took video of the path she used to get in, I'll try and post it too.
Side note: This is not my horse and is just one of the boarders on the property. The goat barn in situated inside one of the pastures where the old mares are kept and gates are normally locked.