Scooby Snacks appear to be habit-forming. Scooby Snacks do not seem to cause nausea. Scooby Snacks should not be consumed while operating motor vehicles or heavy equipment. Shaggy had a cool Cypress Hill-type goatee. Shaggy was really thin, even though he ate lots of Scooby Snacks.
Drug addiction can cause dramatic weight change.
Scooby had a speech impediment. Scooby's nephew, Scrappy, was kinda impulsive and stupid, implying a bit of inbreeding, which is not taboo among dogs. Top Ten Reasons Why Scooby Doo is a Drug Influenced Cartoon Scooby and Shaggy were always being freaked out by ghosts and ghouls, but no one else saw them before Scoob and Shaggy. Scooby and Shaggy always had the munchies. Shaggy always thought Scooby was talking and was the only one who could hear him and understand him.