The best place to find the most clever one-liners and the wittiest dialogue is "It's Always Sunny In Philadelphia" quotes. You won't find funnier quotes anywhere else. Here are just a few of the moments from the show that can't be topped.
Charlie goes American all over everybody's ass. This episode is chock full of great "Its Always Sunny in Philadelphia" quotes. A fan favorite is when Dennis says, "Look, the point is if Charlie took any time to study in school, he would recognize that the Constitution protects my freedom to blow smoke all over his face." That is easily one of the funniest "It's Always Sunny in Philadelphia" quotes.
The gang goes Jihad. This episode has some great "It's Always Sunny in Philadelphia" quotes. The best "It's Always Sunny in Philadelphia" quotes in this episode is this witty exchange when Barbara asks, "While you were out making money, who do you think was at home cooking and cleaning and raising your children?" and Frank answers, "A series of Mexican women." A little racist, but a lot funny. Of course, a lot of the "It's Always Sunny in Philadelphia" quotes are like that.
Dennis looks like a registered sex offender. The last of the top three episodes to have the best "It's Always Sunny in Philadelphia" quotes is the eleventh episode in season three. The best quote from this episode is the exchange between Frank and Charlie about a "bang-maid." Frank says, "Charlie, I need a woman. I need a woman to… to cook for me, and clean up after me and somebody that will do everything I say" to which Charlie responds, "Well, that's just a maid. You want a maid?" Frank yells, "Yeah, that's right, a maid. A maid I can bang. A bang-maid."