Mac (Rob McElhenney) wears a Sig Tau fraternity t-shirt in “The Gang Spies Like U.S.” episode of It’s Always Sunny in Philadelphia (Season 10, Episode 5).
It’s Always Sunny in Philadelphia: Sig Tau
Mac (Rob McElhenney) wears a Sig Tau fraternity t-shirt in “The Gang Spies Like U.S.” episode of It’s Always Sunny in Philadelphia (Season 10, Episode 5).
