Madelaine Petsch reflected on season 4 of Riverdale and revealed which episode was the most fun to film.During a game of Us Weekly’s “I Can Explain,” the Washington native, 25, discussed what costume made work feel like play on the set of the CW show.“Honestly, I think that might’ve been the funnest day on set we had the entire season,” Petsch said looking back at a snapshot of herself wearing a white wig alongside Camila Mendes, Lili Reinhart, Casey Cott and Vanessa Morgan.The castmates were