Be Cool, Scooby-Doo! - Season 2

The gang goes trick or treating on Halloween night but Velma seems to think that Halloween is a disrespect to history while Daphne, Shaggy and Scooby have the opposite opinion. Meanwhile Fred believes you can't solve a mystery on Halloween. But all is explained when the gang runs into a witch and Fred reveals that he ran into the same witch 11 years ago with his cousin.