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Donnie is an ex-boyfriend of Penny.

He is mentioned in "The Boyfriend Complexity" when Penny's father Wyatt tells Leonard about Penny's ex-boyfriends. Donnie is mentioned as a genius and a rocket scientist who was gonna make millions turning farm waste into biofuel and selling it to the government. But all Donnie did was mix pig poop with a little water and pump it into his mom’s Camry. Donnie was a rocket scientist compared to a boy named Curtis who wanted to get beer pong into the Olympics.

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