About five years ago, Seth Rogen posted a picture on Instagram of seven rudimentary clay objects with the caption: “So maybe I joined a pottery studio so I could start making my own ashtrays.” Now, he’s taken his love for pottery to the next level by signing up as an executive producer for the competition show “The Great Canadian Pottery Throw Down.” He also appears throughout the series as a guest judge. Seth tells Tom what inspired his love of pottery, if he finds it therapeutic, and how the imagery and design around weed paraphernalia has changed since legalization.