Mac is one of the owners of Paddy alongside his friends, Charlie and Dennis on It's Always Sunny in Philadelphia.  Mac is generally seen wearing t-shirts, often without sleeves, on account of being so proud of his phsyic.  Unfortunately it doesn't seem to work for the guy as most people see him as the jerk.  Personally, we love the guy.

Mac Quotes

Naked pics online? That's disgusting. On a website? There's so many of them though. Where? Which one?

Mac

Dennis: I am having feelings again. Like some kind of fourteen year old kid. You remember, feelings right?
Mac: Yeah. I have feelings every single day of my life.
Dennis: Do you?
Mac: Are you saying you don't have feelings?
Dennis: What I'm saying is a built up a shell.. a shell around myself. A cold, calculated shell that couldn't be broken by anything but marriage.

It's Always Sunny Quotes

Principal: I'm a little confused, are you telling me this photo of Bruce Jenner is your resume?
Charlie: Well, when I showed up this morning I didn't have a formal resume on me so i was sort of hoping the photograph of Mr. Jenner could represent the standard of excellence I'm hoping to bring to his position.
Principal: And you're looking for a job as a substitute teacher?
Charlie: Substitute janitor.

Frank: When it's white people, it's surviving. When it's black people, it's looting.
Dee: No Frank. It's because the white people are stealing bread and the black people are stealing speakers.