The Electric Horseman (1979)

Tell me Norman… did you think it was going to be this tough to get rid of a pain in the a* like me? Ma'am, I had no idea.

A former champion rodeo rider is reduced to using his saddle skills to promote a breakfast cereal in a gaudy Las Vegas show. When he's asked to perform with a $12 million horse that he discovers is being doped to remain docile, he flees into the desert astride the beast in an act of defiance. A story-hungry female reporter gives chase.