The Richie Rich/Scooby-Doo Show
He offered Scooby three free tickets to Pleasure Island, on the condition that he would not say where he got them. The park had a curse that Shaggy Rogers, Scooby-Doo, and Scrappy-Doo started turning into donkeys after they stayed there long enough. Scooby's nose also grew there whenever he lied. The man tried to capture them, and grabbed Scooby by his long nose, which is when Scooby woke up.
Later, Scooby saw what looked like the same man offering free tickets for something, and he ran. (Scooby-Nocchio)