It's Always Sunny In Philadelphia is always nuts. They rarely have guest stars, but when they do. It is awesome! Like the father from 7th Heaven as Dee and Dennis' real father , that was classic. Tonight they had Sinbad and super hot Rob Thomas from Matchbox 20. Dennis was put in rehab center to make a book he wrote be true and those two were playing loonies that intimidated Dennis. Rob barely talked and it was hilarious. And it turned out it wasn't really them in the story.