OK, you decide to clear your head by taking a run through a beautiful part of a forest near your house. You put on your shorts and running shoes and take off. After a while you feel like someone is following you, but you can't see them. You speed up, the footsteps behind you speed up. You don't dare look back, but you HAVE to. Then you see it! Its not a person after all. A man's terrifying encounter with a cougar on a hiking trail in Utah has gone viral after he managed to record a six-minute video of the incident.