I was watching that clip with the big black con in the pizza shop when he belts the guy who'd gone off on his girlfriend for cutting in the line and spitting on everyone.
There was a lot of talk at the time from the gun crowd about shooting him which was a bs response. Number one he wasn't killing anyone so you couldn't justify use of deadly force; two, it was crowded so no saying you wouldn't hit someone else running into the line of fire accidentally; three, what was the backdrop? i.e. there were cars driving past outside...if your round missed and you hit someone in one of them then good luck...you'll be going away for a long while.
Punching the behemoth for the average person, given he looked to weigh about 310 pounds, probably wouldn't have been viable especially considering if you didn't get a one shot knockout, that you'd be fighting the c**t he was with next. We also don't know that they didn't get out of a car containing four more of his friends which, if the fight became prolonged, would be a total bitch to deal with.
I started thinking about less than lethal weapons that would be (almost always) guaranteed to give you a one shot knockout on that buffoon. They'd have to be concealable which rules out baseball bats, nunchakus, nightsticks etc. They'd need to be surgical i.e. CS would get everyone in the store, including you to some degree or another, and they'd need to be comfortable to carry.
The only thing I could come up with that would fit the bill was the inimitable leather sap as carried by the old time cops. (did they know something we didn't?) It's discreet, slips in a pocket, can be concealed in the palm of the hand so it looks like the recipient was slapped and doesn't cost a fortune (mine was ten bucks at the gun show) so disposing of it later isn't going to cause you to cry.
With two quick swipes you could have knocked a big dose of sleep into him and his ugly arse girlfriend, grabbed your pizza and been off out the door like a rat up a drainpipe.
Perfect choice.
Nick