Seth Rogen was on Jimmy Kimmel Live! on Wednesday night to talk about his upcoming holiday movie The Night Before—an “R-rated, modern take on a Christmas fable,” as he described it. Rogen’s role in the film, as a “guy who goes on a crazy, drug-fueled adventure,” is one that he’s been “researching for many, many years,” Kimmel said—at which point Rogen proceeded to spin one particularly colorful yarn. It starts in Amsterdam, with an implausible amount of psychedelic mushrooms.