On Your Toes! (1927)

"A New Denny. Dancing master, taxi driver, fighter, sheik. A hero---A coward. But above all, a fighter with a fighter's heart! You think you know Denny? He'll amuse you here. He will triple-thrill you as you've never been thrilled before."

Silent boxing sports comedy about a boxer whose grandmother wants him to be a ballet dancer, so he has the boxers at his training camp pose as ballet dancers to fool granny, with predictable results