On the set of Rocky IV, Dolph Lundgren punched Sylvester Stallone so hard that Stallone was required to go to the hospital for a few weeks. Stallone, who played Rocky Balboa, fought Dolph Lundgren’s character, Ivan Drago, in the movie after Drago kills Rocky’s coach and friend, Apollo Creed. Dolph, standing at 6 feet 5 inches of bulk and chiseled muscle, proved to have a bit too much power for poor Stallone. Filming was eventually able to pick back up.