There are a lot of strange shows on TV, but truly nothing compares to It's Always Sunny in Philadelphia. The show has been on the air nearly as long as Grey's Anatomy and should not exist, yet it does and remains an absolute gem.
There was a whole discrepancy in the basis of the show, in the concept of the show that the network fought Sherwood Schwartz on... The network felt that a divorcee created too many problems for the series.