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Basic Trope: An animal plays a sport, since there isn't any rule forbidding it.
Straight: A donkey plays soccer, since there ain't no rule...
Exaggerated: The entire team is replaced with animals.
Downplayed: The team teach their pet to play the sport but he isn't entered in serious matches and is mostly used to entertain the crowd.
Justified: The rulebook states that anything goes unless specifically noted otherwise.
Inverted: "There ain't no rule saying you can't enter a human in the Kentucky Derby!"
Subverted: As it turns out, there is a rule against donkeys playing soccer. Or there is no explicit rule against donkeys playing soccer, but the donkey can't play because he does not meet other established age or medical criteria.
Double Subverted: As it turns out, there is a rule against donkeys playing soccer... but not mules.
Parodied: "Ain't no rule about donkeys playing soccer." "Yes, yes there is. It's right here in the rulebook!" "Shush."
Zig Zagged: ???
Averted: Despite the movie heavily featuring a specific animal that does tricks, animals and the sport in question are never mentioned in the same sentence.
Enforced: "We want to make a movie about a donkey playing soccer, so we'll just pretend the rules say nothing about the species of the players."
Lampshaded: "Don't you think they'd've been smart enough to close the animal loophole after Air Bud?"
Invoked: The sports league deliberately leaves this kind of loophole in its rules in order to encourage its coaches to think outside the box.
Defied: The sports league does have rules about the species of the players, just to prevent this kind of situation.
Discussed: "I remember last year, when one football team had a bison. That was a crazy season...."