This horse, Shamrock, is a retired race horse.  Key word: RETIRED.  Well, someone should probably tell Shamrock that!Recently, while out for a regular ride, Shamrock decided to briefly come out of retirement, much to the dismay of his British rider friend.  "Sham" took off down a muddy path and his rider held on for dear life for as long as possible, while trying to coax the massive beast into slowing it down a bit.  He failed and was eventually thrown off the horse, where made the most girly noise ever upon impacting the ground.

Since we don't have an update on this video, we'll just assume that Shamrock is still running...because that's just what horses do.