<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> Mr. Moose was a puppet character on the children's television show Captain Kangaroo . </P> <P> He would tell riddles and knock - knock jokes that would result in hundreds of ping pong balls falling from above, and hitting the Captain on the head . Mr. Moose was created and played by Cosmo Allegretti, who also created and played Mr. Bunny Rabbit, Dancing Bear, and the Captain's painter and handyman Dennis . </P> <P> In the animated television series Family Guy episode "Hell Comes to Quahog", after Joe sends a ping pong ball out a window, Peter persuades Mr. Moose to say "Knock, knock", then answers "Ping pong balls!", and ping pong balls fall on top of Peter . </P>

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