Another big Sundance deal. Amazon/MGM bought Megan Park’s “My Old Ass” for $15 million. The film is said to be a crowd-pleasing coming-of-age story about a bright soon-to-be collegiate (Maisy Stella) who comes face-to-face with her older self (Aubrey Plaza) during a mushroom trip. Amazon/MGM are already planning a wide theatrical release for the film, which has garnered strong reviews — 77 on Metacritic and 100% on Rotten Tomatoes.