This is one of those. For ages I forgot completely about the Scooby movies until they were replayed on Cartoon Network.
This is the movie I remember best from being a little kid. It's a great episode. Okay, so I admit that I didn't really know who Sonny and Cher were back then! But despite that, the laughs were great and the mystery was awesome.
It's worth watching. It's a classic epsiode that makes you feel three years old in your pajamas on a Saturday morning all over again!