41 Things You Might Not Know About "It's Always Sunny"

The Gang Gets Factual.

RCG Productions / FX / BuzzFeed

1. The show is a real family affair. As most people know, Mac and Dee are married in real life, as are Charlie and The Waitress. On top of that, Caylee, the woman Dennis "re-D.E.N.N.I.S.es" in "The D.E.N.N.I.S. System" is actually his wife, Jill Latiano.

2. Day met Mary Elizabeth Ellis (The Waitress) in 2004 when they played incestuous twins on Reno 911.

3. The reason Glenn Howerton's...

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