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Insane Fan Theories About It's Always Sunny in Philadelphia

List RulesVote up the theories as insane as the gang.

Coming up with fan theories for your favorite show is almost as much fun as watching it. Some TV shows more than others, though, leave themselves open for discussion. Take It's Always Sunny in Philadelphia, for instance - an absurd, dark farce about five degenerates (Charlie, Dee, Frank, Dennis, Mac) who run a bar in Philadelphia is very fertile soil for harebrained, insane fan theories. 

Fan theories about It's Always Sunny in Philadelphia run the gamut, and there's no shortage of people on sites like Reddit bouncing them around. There's the one about Dennis being a murderer. Another It's Always Sunny theory involves figuring out the name of the gang's waitress frenemy. 

With 11 seasons behind it and three more on the way, there's plenty of room for more speculation and fan theories, especially on how it will end. Some fans think it might go the way of Seinfeld, a show to which it's been compared, with the gang in prison or on trial. Whatever theories you believe, there's probably a wackier one out there, so let's take a look at the craziest fan theories about It's Always Sunny in Philadelphia.  
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  • 5
    303 VOTES

    Dee Was the Normal One at First Because She Was Medicated

    Photo: 20th Television

    This fairly obscure theory claims Dee was at first fairly levelheaded (even getting her psychology degree at the University of Pennsylvania) because she was on medication and in therapy after being institutionalized for setting her college roommate on fire.

    This arson incident is referenced in several episodes, and the theory goes on to state that Dee began working at Paddy's when no longer under state supervision, at which point she lost her access to therapy and medication. Without medication, Dee slides downhill like the rest of the gang. In one episode, she tries to get medication by saying that she had a “hankering” to burn someone again.
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  • 6
    527 VOTES

    Dennis Is a Murderer

    Photo: 20th Television

    The battle for biggest degenerate on It's Always Sunny rages on episode by episode, but Dennis takes the cake for most consistently psychotic. One fan theory speculates that Dennis murdered a guy named Brian LeFevre, whose wallet the gang found (and ransacked).

    So what does Dennis do? He poses as Brian LeFevre for a week, and relishes the thrill of getting inside another man's skin Then, somewhat mysteriously, Brian LeFevre is found murdered outside Paddy’s Pub. Charlie suggests he was killed by a crackhead. Remember back when Dennis and Dee were crackheads in a Season 2 episode?

    The theory goes into a lot more detail than this, bringing up evidence from multiple seasons. Definitely worth checking out. 
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  • 7
    364 VOTES

    Carbon Monoxide Is Causing the Gang’s Slow Death

    Photo: 20th Television

    This wacky fan theory suggests that the bar’s carbon monoxide leak is slowly killing the gang, or at least causing brain damage. If you remember, the gang started the show as well-meaning screw-ups trying to run Paddy’s Pub. Then Dennis beat Charlie over the head while training him to fight, causing brain damage that eventually led to Charlie ignoring the warning beeps of the CO detector. Now they all seem insane. 

    In Season 9, we learn the carbon monoxide detector has been going off for years, but Charlie keeps turning it off, because the CO is killing the rats in the bar. 
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  • Photo: 20th Television
    If you’ve watched Always Sunny from the beginning, you probably remember the gang started off as lovable losers, not total degenerates. Charlie, while maybe not the sharpest knife in the block, wasn’t completely illiterate or stupid, but damaged. But in the middle of Season 2, Dennis and Mac decide to train Charlie for an underground fight club and, in a scene out of Rocky, beat him silly with bats, chairs, and more. The next episode shows Charlie barely able to read. This fan theory may just stand up.
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