If you’ve seen "My Old Ass," which is new on streaming on Amazon Prime Video subscription, you know it’s one of the most endearing movies of the year. I don’t know about you, but I’m still not over the fact that in the movie, Maisy Stella’s Elliott has a mushroom trip where she breaks into song to serenade Justin Bieber to her crush. When CinemaBlend spoke to the movie’s star, she clearly still wasn’t over it either. Stella and writer/director Megan Park broke down how the scene became part of the movie.

Early into the film, Elliott and her friends go out to the Muskoka woods on her 18th birthday to indulge in a mushroom trip. It appears to conjure Elliott’s 39-year-old self (played by Aubrey Plaza), who cautions her to stay away from a guy named Chad, whom she meets not long after their conversation. As Elliott starts to find herself crushing hard on Chad without a red flag in sight, she decides to try the mushrooms again in hopes of talking to her older self again. But this time, the trip has the teen living her nine-year-old Justin Bieber fantasy, leading into an unexpected music number in the movie.