"Expecto Patronum," Luna called out. Suddenly a silverly image of a duck billed Patypus appeared. "Excelent work Luna," Harry said. "Thank you, I think I'll name him Perry."
Dementorsmirtz: A platypus Patronus?
Patronus puts on Fedora.
Dementorsmirtz: Gasps. A Perry the Platypus Patronus!