When did this happen?

I am away from home this week and thus away from my DVR. Which means I am exposed to the harsh reality of TV with commercials...and having to flip around the channels to see what is on. I swear to god, "It's Always Sunny in Philadelphia" in on three different channels over the course of one evening here. When did that show get so popular that it could be put into reruns? And why don't I get it?

PS: Just got back in from the Mates of State show. AWESOME. So glad I went!!!