Show jumping in a mechanical hackamore.
<a rel="nofollow" class="external text" href="http://www.dfj.com/steve">Steve Jurvetson</a> from Menlo Park, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jurvetson/142556533">Flickr</a>