5. Jason "Mayhem" Miller
The only man on this list whose nickname comes from his antics outside of the cage instead of in it. There is one thing you need to know about Mayhem. He is bat sh*t crazy. Really just type his name into Google and see the results. When you see Mayhem on camera, it is only a matter of time before he does something that freaks you out. Really, you are going to question his sanity anytime you see him. During a live Strikeforce event on national television, Mayhem unexpectedly went on camera to challenge Jake Shields to a rematch. When you put Mayhem and the Diaz bros together the only result it something that resembles a nuclear holocaust. Months ago, he ran into a church with a fire extinguisher and covered the place with foam. When the police came they found him naked on a couch. He acted perfectly normal when they found him.