One of the best stories I'd heard on the making of a movie was when Richard Donner visited Marlon Brando to convince him to play Superman's father, Jor-el. But Donner had known Brando was squirrely and often hard to get a straight answer out of. So when Donner arrived, and began discussing the film, Brando interjected and said he'd play the character as long as it looked like a donut. Donner was completely confused, with Brando doubling down saying the character was an alien, shouldn't look human, and maybe should look like a donut. Donner realized Brando's reputation wasn't so much that he was difficult, it was that he loved messing with people. Donner, being a prankster himself, agreed that Jor-El should look like a donut. And that's when Donner noticed the glint in Brando's eye. That day Brando agreed to play the part normally, he just wanted to make sure Donner had a good sense of humor.