"The other thing I wanted to do that I almost did was Chris Rock ... the Will Smith slap," Seinfeld explained. "I was going to have somebody come up on the stage and have Chris punch 'em out ...

“The other thing I wanted to do that I almost did was Chris Rock ... Smith slap,” the Seinfeld alum explained. “I was going to have somebody come up on the stage and have Chris punch ...

After Oscars presenter Chris Rock made a joke ... on the other end of that slap." Smith and Rock are both comedians, and as the saying goes, the best jokes punch up not down.