Fights that lastest under 30 seconds

[Wayne]

I'm pretty sure it went longer than 30 seconds (39 I think), but another really fast fight was Tyson vs. Michael Jack Johnson. Tyson landed a monster right hand that almost decapitated Johnson and the fight was over.
Might have been the hardest single punch that Tyson ever landed.

Oh, you mean the punch that turned Johnson's head like an owl? His jaw had to have been broken after that.