Mary calls umami the "sixth sense" and Billy gets irrationally angry; guest Rachel provides a lot of tedious information about the Harry Potter series.
Mary discusses the dangers of imagination in the Wizarding World; Billy doubts that owls are faster than the internet; guest Abby leads (and misleads) a long attempt to discover Voldemort's middle name.
Billy tells Mary he wants to see her throw up; Mary is horrified by Billy's hideous description of "thestrals;" guest Madison describes intentionally peeing her pants during the Deathly Hallows Part 2.
Billy flexes his knowledge of such hip terms as "tea" and "stan;" Mary discusses vaping in the Wizarding World; guest Marae extols the coolness of the character Sirius Black.
Billy refuses to accept a friendship between a professor and a hat; Mary reveals details of the origin story of her menstruation; guest Meredith proclaims her attraction to Young Ol' What's His Name