This strikes me as quintessential Wikipedia. I love that someone thought that a reader interested in the Russian tsar Boris Gudunov (1551-1605) would want to know about a character in the animated cartoon Bullwinkle, and that a moderator would challenge this information with a request for a citation. Wonderful!

A play on the name Boris Gudunov was Boris Badenov, an antagonist of Rocky and Bullwinkle.[citation needed]