It’s Always Sunny in Philadelphia: The Best Girls Are From Philly

Dee (Kaitlin Olson) wears a The Best Girls Are From Philly t-shirt in the “Charlie Wants An Abortion” episode of It’s Always Sunny in Philadelphia (Season 1, Episode 2).

It’s Always Sunny in Philadelphia: Life Is Happy

Charlie (Charlie Day), Dee (Kaitlin Olson) and Frank (Danny DeVito) wear Life Is Happy t-shirts Frank bought at the airport in the “Mac Kills His Dad” episode of It’s Always Sunny in Philadelphia (Season 10, Episode 7).