Sylvester Stallone
In “Rocky IV,” Stallone told his co-star Dolph Lundgreen to actually try to knock him out. So, Lundgreen punched Stallone in the chest, which cause his heart to knock into his breastbone and begin to swell. Stallone’s doctors didn’t even believe that the injury could have been caused by a person, because the injury is often seen in victims of a car crash.