Insane Fan Theories About It's Always Sunny in Philadelphia

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.

In the 2015 episode “Charlie Work,” the imbecilic Charlie suddenly becomes a genius problem-solver, working several steps ahead of everyone else to make sure the bar passes a health inspection. If you think back, there have been other times Charlie displayed genius: he became the world’s best player of an RPG; he plays keyboard with mad skill; he invented Kitten Mittens; he can draw really well.

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.

Theories that Dennis is a serial killer exist, and have some merit, but it's really hard to argue against the theory that he's a sociopathic rapist. 

The evidence? Well, there's the implication. And the fact that he keeps zip ties and duct tape in his trunk. There's also his D.E.N.N.I.S. system, through which he describes the process of emotionally luring women for sex only to dump them immediately. In one episode, he even offers to rape the wife of a lawyer. And, of course, he's been known to say things like,“I’m not going to take no for an answer...because winners, we don’t listen to words like 'no' or 'don’t' or 'stop'!”

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.

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?