Mike Tyson said, "Everyone has a plan until they get punched in the face."  I think that this MMA fighter's plan was to get punched in the face, but he definitely overestimated his toughness.

The MMA ring is no place to act tough, especially if your definition of acting tough, is getting hit in the jaw.  I think the main lesson to be learned here is that there is only one 'King Hippo', and this guy is not it.