Total Nerd Insane Fan Theories About It's Always Sunny in Philadelphia  

Stacie Hougland
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List Rules Vote 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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The Series Ends in Court

The Series Ends in Court is listed (or ranked) 1 on the list Insane Fan Theories About It's Always Sunny in Philadelphia
Photo: 20th Television

In keeping with the spirit of a show often described as Seinfeld on crack, one fan theory claims that the entire series takes place in a courtroom. As per this theory, each episode is actually testimony from the gang, which they give against one another. The finale will reveal all of this, and play out exactly like Seinfeld's end.

To back this theory up, its creator points to the fact that each episode begins with a day and time, as though it stands as a precise testimony to events taking place on a specific day, at a certain time. This means, essentially, that the entire show takes place in the past tense.

So what landed them in court, and why are they giving testimony? Well, something big, the theory presumes. A federal case or class action lawsuit. A Redditor suggests calling the show's finale "The Gang vs. The State of Philadelphia."
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"The Nightman Cometh" Is Based on Charlie’s Sick Family -- and Mac

"The Nightman Cometh" ... is listed (or ranked) 2 on the list Insane Fan Theories About It's Always Sunny in Philadelphia
Photo: 20th Television

Season 4’s finale was the brilliant musical "The Nightman Cometh," which features Charlie’s creations: the Nightman, who sneaks in to rape Charlie at night; the Troll, who sells a boy to the Nightman; and the Dayman, who fights the Nightman.

A fan theory proposes that the Nightman is Charlie’s uncle Jack, a pedophile who may have molested Charlie as a boy. The Troll is Charlie’s mother, who allowed Jack to bunk with Charlie for rent money. The Dayman is Mac, whom Charlie cast in the musical, and was his oldest (and most likely only) childhood friend. 
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Dennis Is a Murderer

Dennis Is a Murderer is listed (or ranked) 3 on the list Insane Fan Theories About It's Always Sunny in Philadelphia
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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Carbon Monoxide Is Causing the Gang’s Slow Death

Carbon Monoxide Is Causing the... is listed (or ranked) 4 on the list Insane Fan Theories About It's Always Sunny in Philadelphia
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.