Nick Diaz and GSP
Kimbo and Fedor
Who else? 
whistleblower and orcus
Kimbo looks scary but has a shitty record, while Fedor looks soft but has the greatest undefeated record in MMA history
Anderson and Chael
Aoki and Brock
TTT
Dana and Bud Selig
Jose Aldo, Hatsu Hioki