I was at an Irish pub after work and the bartender, as well as the two girls next to me, we're throwing some kind of dumb Philly lovefest that I broke up in characteristic Federwang fashion. Then - somehow - conversation shifted to It's Always Sunny in Philadelphia and one of the broads grew up with Rob McElhenney (Mac). I was unaware there are a bunch of inside jokes for the yokels from the first season. Pretty neat.