This pony was clearly done with walking and just wanted some playtime.
A video posted to Facebook shows the girl giggling as her horse started kicking up water in a giant puddle. Then, the horse slowly lowers himself into the puddle, with the girl still on its back.
Suddenly, he lunges to the side, knocking her right off his back and into the dirty water. She giggled her way through the whole thing, and luckily no one was hurt.
Watch the hilarious moment above.