There’s a reason filmgoers have always believed that Marlon Brando‘s Terry Malloy was once a serious boxer. When Brando explains to crime commission investigator Leif Erickson that he let his opponent “tag me for a couple of rounds,” he starts performing the moment with that deflection thing, twice jerking his head and neck just so. You knew Brando had done at least some training in the ring, and that was what sold it.