Theories run the gamut from time travel, to crackpot biology, to psychic echoes and cosmic horror. Harbour’s a really good sport here, engaging with the theories pretty thoughtfully. He may not be a writer on the show, but that’s even more fun, actually. He doesn’t know the answers, so he’s free to play along.

This video also is evidence of one thing: Reddit usernames are hard to pronounce. Such things were never meant to be read aloud.