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|This needs a stretch.|
The Teen Science Fair is a demonstration of science projects and inventions.
The Richie Rich/Scooby-Doo Show
Shaggy Rogers, Scooby-Doo, and Scrappy-Doo entered the fair with a pizza-making machine. They got caught up in the demonstration of another invention and Shaggy and Scooby had their minds swapped. (Who's Scooby-Doo?)