Conan O'Brien's Announcer

A booming, unseen voice heard only for a moment inside Futurama's Head Museum, introducing the preserved head of Conan O'Brien to the tour group with the practiced enthusiasm of a theme-park narrator. He exists purely to deliver the setup, then vanishes as quickly as he arrived.

Billy West, already voicing half the cast, tucks in one more voice just for the joke's timing, giving the announcer the plummy, hollow cheer of a nature-documentary host. It is a throwaway bit, but the commitment to that tone is what makes the gag land instead of just existing.