Mac tries to look cool and dresses as Viggo Mortenstein from the Lord of the Rings movies.
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Charlie attempts to dress like a vampire when he puts on a Phantom of the Opera costume on Always Sunny.
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Artemis and Frank have a little lovers quarrel in costume during the Always Sunny Halloween-themed episode.
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A picture from the Halloween episode of It's Always Sunny episode, "Who Got Dee Pregnant?" Dee is pregnant and the guys try to figure out who the father is.
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Mrs. Mac and Mrs. Kelly move in together after Mrs. Mac burns her house down. Yes, we know this picture isn't from that episode, but look at them together.
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Mac and Charlie get stuck in the bottom of a drained pool in "Mac and Charlie: White Trash."
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Charlie plays a little hockey in his Philadelphia Flyers jersey on Always Sunny.
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Charlie is stuck diving to clean the boat when the gang gets a boat. Just another Charlie job.
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It's Always Sunny Quotes

Frank: I opened up to a therapist just once. I was a kid. I got into a fight. The doctor asked me question after question, got me so scrambled up. Next thing I know, I was shanghai'd upstate to a nitwit school. You know what a nitwit school is?
Therapist: I assume you mean a school for the mentally disabled.
Frank (spits pistachio shell): Yeah, not just for nuts in the head, but bodies, too. Back then science was real crude, they stuck us all together. My roommate was a frog-kid. You ever see a frog-kid?

No I don't eat dragon, cause, uh, it's not a meal for peasants, it's a meal for kings, and I'm sort of a common man. But they don't eat us, it's a common misconception. They actually eat gold and treasure -- that's why they're always sitting on a pile of it.

Charlie