It’s in The Champ, the 1979 Jon Voight movie about a washed-up old boxer and his adorable son, played by Ricky Schroder. A couple of researchers figured out that showing people the two-and-a-half-minute climax of the film, which you can watch here, was the easiest way to get them crying without punching them in the face. [Smithsonian via Moviefone]
