Richard Chin in Smithsonian:
In 1979, director Franco Zeffirelli remade a 1931 Oscar-winning film called The Champ, about a washed-up boxer trying to mount a comeback in the ring. Zeffirelli’s version got tepid reviews. The Rotten Tomatoes website gives it only a 38 percent approval rating. But The Champ did succeed in launching the acting career of 9-year-old Ricky Schroder, who was cast as the son of the boxer. At the movie’s climax, the boxer, played by Jon Voight, dies in front of his young son. “Champ, wake up!” sobs an inconsolable T.J., played by Schroder. The performance would win him a Golden Globe Award.
It would also make a lasting contribution to science. The final scene of The Champ has become a must-see in psychology laboratories around the world when scientists want to make people sad.
The Champ has been used in experiments to see if depressed people are more likely to cry than non-depressed people (they aren’t). It has helped determine whether people are more likely to spend money when they are sad (they are) and whether older people are more sensitive to grief than younger people (older people did report more sadness when they watched the scene). Dutch scientists used the scene when they studied the effect of sadness on people with binge eating disorders (sadness didn’t increase eating).
More here.