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.
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.
Mac: Fight Milk! The first alcoholic dairy based protein drink for bodyguards!
Charlie: By bodyguards! I drink it every morning so I can fight like a crow.