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The organ playing ghost was one of the real ghosts in a house.
The ghost is slightly transparent and is a bluish-white color. It wears a cloak and has skeleton hands and a skeleton face. It doesn't have feet, but rather the cloak narrows and eventually ends, forming a tail-like shape. It is similar to the ghosts which hid under a bed.
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The New Scooby and Scrappy Doo Show
The ghost appears in a haunted house which Scooby-Doo, Shaggy Rogers, Scrappy-Doo, and Daphne Blake are staying in. The ghost is playing an organ when it first appears. Daphne and Scrappy are in another room during the incident, but Scooby and Shaggy attempt to take a picture of the ghost in order to prove the house is really haunted. The ghost chases them away, but Shaggy manages to take a snapshot of it. Unfortunately, Shaggy realizes he held the camera backwards when he shows the automatic photo to Daphne and Scrappy .