“The Gang F***s Up Abbott Elementary” is a flex, raising the curtain on Sunny ’s 17th season with a vivid illustration of the show’s consistency. Photo: Patrick McElhenney/FX Spoilers ahead for “The Gang F***s Up Abbott Elementary,” the season-17 premiere of It’s Always Sunny in Philadelphia. If there were only one reason for the Abbott Elementary and It’s Always Sunny in Philadelphia crossover to exist, it would be to see prim, proper, borderline-prissy Janine Teagues tell a documentary camera