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[[caption-width-right:300:And they say math is hard. [[note]] The actual answer is 5 cm. [[/note]] ]]
->'''Q:''' Explain Newton's First Law of Motion in your own words.\\
'''Calvin:''' ''(writing)'' Yakka foob mog. Grug pubbawup zink wattoom gazork. Chumble spuzz. ''(aside)'' I love loopholes.
Someone -- typically but not always a RulesLawyer -- does something outrageous by finding a loophole in the rules, which were too [[ExactWords narrowly written]] to consider such possibilities. Loophole Abuse is a form of RefugeInAudacity -- which still allows the agent to claim they were [[JustFollowingOrders following the rules]].
Sometimes the loophole doesn't really exist, but the competitor makes everyone ''think'' it does. Occasionally, the loopholes were planted to ''enable'' Loophole Abuse.
In games, this may often be the result of some kind of oversight by the creators. A programming oversight can cause someone to do something they did not intend, such as [[LordBritishPostulate killing a mob intended to be invincible]].
In RealLife, this is rare for two simple reasons: First, loopholes are quickly closed once discovered, sometimes by an ObviousRulePatch. Second, many systems have RuleZero: some designated referee, judge, or [[GameMaster authority figure]] has the absolute final word and can simply throw the argument out wholesale, usually by claiming that the "spirit" of the rule never intended to allow what the "letter" of it seems to say. On the other hand, some "loopholes" were actually [[TheDevTeamThinksOfEverything exceptions put in the rule for a reason]] and as such are (or have become) part of the rule.
Several examples refer to the [[RenamedTropes old name]] of this trope, Ain't No Rule.
* [[LoopholeAbuse/AnimatedFilm Film — Animated]]
* [[LoopholeAbuse/LiveActionFilm Film — Live-Action]]
** [[LoopholeAbuse/RealLifeLaw Law]]
** [[LoopholeAbuse/RealLifeSports Sports]]