http://youtu.be/YYtwna1PPTY
The thing that struck me here isn't that they're fighting, or that he's wearing a microphone, but what he actually says to the guy...
"You want to? Ok. Square up? Good luck, then."
"How about a round of fisticuffs good sir?"
"Righto! Now, then, shall we?"
(http://cdn5.movieclips.com/mgm/b/back-to-school-1986/0049840_4482_MC_Tx360.jpg)
LOL