It's the great John Candy's birthday so here's a fun story:
The night before they filmed this scene from SPLASH, producer Brian Grazer said that John Candy had gone out to party with Jack Nicholson until 5AM the night before, immediately came to set after to film the racquetball scene, and Candy played the character how he really felt: Extremely hungover.
Grazer said, "The night with Nicholson, I think he overdid it, so he literally ran into the ball that hit him in the head."
Amazing.