TMZ.com
Will Smith is an adept face-slapper, even teaching youngsters the ropes on how to wind up and deliver.
TMZ has obtained footage shot back in November showing Will and his “King Richard” costar, Aunjanue Ellis, on a junket. There was a Q&A and a little guy named Chris — yes, that wasn’t lost on us — asked how to fake fight in flicks.
Will decided to show Chris some movie moves, calling the kid up on stage and showing off his slapping skills. Of…