Comedy veteran Sheryl Underwood says the surprise “r-word” joke from Dwayne Johnson during Netflix’s “The Roast of Kevin Hart” worked because roast comedy plays by a different set of rules … and she says audiences understood the context.…

Comedy veteran Sheryl Underwood says the surprise “r-word” joke from Dwayne Johnson during Netflix’s “The Roast of Kevin Hart” worked because roast comedy plays by a different set of rules … and she says audiences understood the context.…