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One Got Fat is a 1963 bicycle safety film narrated by Edward Everett Horton. In the film, ten friends who are children with monkey masks and tails, plan on going to the park for a picnic. They all ride there on their bikes, but each one meets a different fate on their way to the park as a result of their failure to follow specific bike safety rules (like not making hand signals, not reading traffic signs, not riding with traffic, riding double, or riding on the sidewalk). One by one, each of the friends makes a mistake and suffers an interesting fate. In the end only one of the friends (who not only followed all the bike safety rules, but is also a normal human, whose face is not shown until the very end) makes it to the park and eats all the food by himself. Thus, as the title says, "One got fat!". It can be viewed here. Also available as a RiffTraxVOD short.
The Ace: Phillip Floogal is mentioned as being a star athlete, the class president, an honor student and having the handsomest profile in school.
Agony of de Feet: One of the monkeys, due to having his bike stolen (he forgot to get a license, so the police had nothing to go on), is forced to run after his friends. He eventually collapses when his feet wear out.
Big Eater: Based on his body type and the size of his lunch bag, it's safe to assume that "Slim" Jim Maguffny is one of these.
Jerkass Gods: This is one interpretation of the narrator. This is most apparent when a steamroller just happens to come by at exactly the right moment to run over Filbert Bagel (the one who neglects to tune up his bike).
Killed Off for Real: Not explicit, but seeing as how the characters meet fates such as being hit by traffic and getting run over by a goddamned steamroller, it's more than likely that not all of the monkeys survived.
This is supported by the fact that not all the monkeys are present at the hospital at the end of the film. They're probably at the morgue.