Supernatural has had its fair share of hilarious episodes over 15 seasons. That said, three pop to mind when I think about the funniest of the show's run. These are: "Mystery Spot," which was Supernatural's take on Groundhog Day, where Dean kept dying at the end of every day; "The French Mistake," where Sam and Dean came to the real world; and "Scoobynatural," which was Supernatural's animated crossover special with Scooby-Doo.
