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: Bro, when you tack on mass, you sacrifice flexibility. That's just a straight up fact
Charlie: That's insane. Touch your toes.
Mac: What am I a gymnast?
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.