Invisible Duck
Ghost Duck
Classification Duck
Real world information
Appears in The Grim Adventures of Billy & Mandy
First appearance Duck!
Voice actor Wikipedia:

The Invisible Duck ghost first appeared the episode "Duck!". It kept making people think that the person that sees it first farted. It does that by doing raspberries. It was first seen by Grim, who got sent to jail for people thinking it was him. Then next was Irwin who was also sent to jail with his dad and grandmama. Then it was Harold who saw it. But finally Mandy got rid of it. Before the Duck disappeared, it made a real fart.

The Invisible Duck also appeared in Billy and Mandy's Big Boogey Adventure.

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