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[[quoteright:330:[[Film/TheBigLebowski http://static.tvtropes.org/pmwiki/pub/images/serious_business_bowling_1386.png]]]]
[[caption-width-right:330:"This is bowling. There are ''rules''."]]
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->''(Kaiba is about to jump off a castle's battlement)''\\
'''Yami Yugi:''' Dude, don't you think you're overreacting a little? I mean, it's just a [[CardGame card game]].\\
'''Kaiba:''' Card games are serious business!
-->--''WebVideo/YuGiOhTheAbridgedSeries''

Serious Business is when a story revolves around an activity where a sizable portion of the in-story population takes it ''far'' more seriously than they should. If the popularity of [[MundaneMadeAwesome some mundane object]] rivals that of Music/ElvisPresley, Music/TheBeatles, and Music/MichaelJackson combined; or if there are mainstream ''schools'' devoted to it instead of teaching reading, writing, and arithmetic, then it's Serious Business.

It's often a SillyReasonForWar, and can turn a casual conversation into a heated CavemenVsAstronautsDebate. Frequently "opposed" by the CavalierCompetitor. Compare StopHavingFunGuys. In musicals it's often demonstrated that DancingIsSeriousBusiness. For the saying that "TheInternetIsSeriousBusiness", see {{GIFT}}. Related ImNotHereToMakeFriends.

Compare DuelsDecideEverything, ComicalOverreacting. When a relatively minor crime is treated as SeriousBusiness, that's FelonyMisdemeanor.

Contrast NotAGame, MatterOfLifeAndDeath.
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!!Examples:

[[index]]
* SeriousBusiness/{{Advertising}}
* SeriousBusiness/AnimeAndManga
* SeriousBusiness/{{Comics}}
* SeriousBusiness/{{Film}}
* SeriousBusiness/{{Literature}}
* SeriousBusiness/LiveActionTV
* SeriousBusiness/{{Music}}
* SeriousBusiness/ProfessionalWrestling
* SeriousBusiness/{{Sports}}
* SeriousBusiness/TabletopGames
* SeriousBusiness/VideoGames
* SeriousBusiness/WebComics
* SeriousBusiness/WebOriginal
* SeriousBusiness/WesternAnimation
* SeriousBusiness/{{Other}}
* SeriousBusiness/RealLife
[[/index]]
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