Scooby-Doo, Where are You! [1969-1971] is a famous American animated television series created for Hanna-Barbera Productions. Numerous spin-offs have been created through out the years.
Season 3 - 8F20 - Black Widower

The Simpsons' episode ends the same way most Scooby-Doo episodes ends:

  1. Bart explains Sideshow Bob's complicated crime to the viewers in retrospective.
  2. Sideshow Bob says the infamous quote: "And I would have gotten away with it, if it weren't for you meddling kids!"
  3. Everyone laughs of a lame joke.
Season 6 - 2F06 - Homer: Bad Man

One of the protestors looks like Velma.

Season 6 - 2F16 - Who Shot Mr. Burns? (Part one)

Chief Wiggum try to unmask Mr. Burns Scooby-Doo-Style, only to realize that he's not wearing a mask. He's just wrinkled.

Wiggum: Just a minute! This isn't Mr. Burns at all! It's a mask!
Wait, it IS Burns. Heh, his wrinkly skin, it...looks like a mask

Season 8 - 4F02 - Treehouse Of Horror VII
Homer unmasks the presidental-candidates.
Season 13 - CABF22 - The Parent Rap
A dog who looks like Scooby-Doo is seen in the backseat of the police car.
Season 16 - GABF09 - The Father, the Son, and the Holy Guest Star
Reverend Lovejoy's "The Ministry Machine" bares a striking resemblance to "The Mystery Machine."