Crazy things you've seen your horse do?

When I got my first horse my family and I didn't have property yet to keep the horse on so we held her at a boarding facility for horses, where they had quite a bit of property and trainers available for hire, along with contests.

The important part of this story is the fact that we held the horses in separate pens, and there was a lot of other horses here.

Well, my horse being the smart girl she was found out how to unlock the pen with her mouth, and was able to get out whenever she wanted. Apparently she got bored being the only horse out though... So she started opening the other horses pens.

It was the funniest yet strangest moment when I got a called from the owner of the property asking if I could come down as quickly as possible, because she needed me to get my horse and help her get the other 15 my horse let out as well.

Anyone else have their horse do this? Or seen your horse do something funny/strange?

I used to have a beautiful white Arabian gelding that was incredibly smart; and he had a delightful sense of humor as well. When he wanted to get my attention he would pull the halter off of Goldie (our other horse), and then he would carry it in his mouth down to the big metal farm gate near the driveway. Using his head, he would clank halter against the gate, and the metal fittings on the halter made a terrible racket.
When he saw me coming outside to see what all the racket was; his ears would perk up, and he would hang his head over the fence and swing the halter up and down so i was sure to see it. Plainly as if he could talk, he was telling me "LOOK ! ! I've got Goldie's halter." and he would be so proud of himself for his little joke.
He could also open the pasture gate and sometimes we would hear him and Goldie galloping down the driveway at night; and then of course, he had to pretend to be wild and not be caught until he was tired and ready to come back home.