The Scooby-Doo/Dynomutt Hour (TV Series)
The Headless Horseman of Halloween (1976)
Daws Butler: Scooby Dum
Quotes
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Scooby Dum : [after swiftly searching for clues] Nothin'.
Shaggy Rogers : No clues?
Scooby Dum : Uh-uh.
Velma Dinkley : Then, what's that stuck to the end of your nose?
Scooby Dum : Nose? What's a nose?