One of the best parts of Mad Men is the music that they play at the end of every episode. In case you stopped before the credits rolled on the fourth episode of season five, there was one song in particular that caught many of us off guard...or, rather struck us. Sorry, just trying to soften the blow here. The guy they're singing about was probably just really stressed out. I mean, there's no way for dinner to be on the table at five p.m. sharp when you're dating a musician.
Plus, in the sixties it was a sign of respect to high-five someone the face.