There are only 2 things that come from the back end of a horse. One is their hooves. It is not fun to be around either of the things that back end of a horse can do. Most of us learn early on to avoid that particular area. The branding one looks like a greenhorn at a dude ranch, the guy on the street looks like.....well..... a horses back end, if you get what I mean.
this is the other thing.
http://www.youtube.com/watch?v=8u_lQrmHXRk