This is an old photo, but only recently dug out of my archive. I wish I had some more and better photos from this event! This is a Mounted Police display at the annual horse fair in Texcoco, outside of Mexico City. These guys did some crazy stunts, such as the galloping pyramid shown here.
They did another one in which four guys galloped up on an "unsuspecting victim" (played by a fifth police officer standing on the ground) and grabbed him by both arms and legs, and carried him around like a human airplane. They were a big hit with the crowd!