On last night's episode of It's Always Sunny in Philadephia , Dee had a heart attack, which prompted the gang to come to grips with the fact that none of them have health insurance. Charlie and Mac decided to get side jobs for the benefits, and ended up working in a mail room. Mac decided that he was going to move up in the corporate world a la the movie The Secret of My Success , thinking that he could work in the office of a guy who is on vacation. When Charlie asked him how the movie ends, Mac responded, "Oh they play that song from the '80s: 'Day Bow Bow.'" ("Oh Yeah," by Yello.) Clip above.