A Study In Wet was a short film that made by Homer Groening (Matt Groening's father) in 1964. This film shows the beauties of water in many forms, catches the excitement of surfing and demonstrates unusual filmmaking.
But as of now, the only 3:51 part of that film found while the other part is missing.
Some footage is also found in a logo for Matt Groening's production company, The Curiosity Company, which can be seen at the end of The Simpsons and Futurama and Olive the Other Reindeer.