Batman: The Brave and the Bold (TV Series)
Battle of the Superheroes! (2011)
Diedrich Bader: Batman
Quotes
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Superman : Mr. Mxyzptlk!
Mr. Mxyzptlk : Superman! And Batman! What fun!
Batman : And I thought Bat-Mite was a weird one.
Superman : Don't worry. I just need to trick him into saying his name backwards. Knock knock.
Mr. Mxyzptlk : A joke? I love jokes! Who's there?
Superman : Kltpzyxm.
Mr. Mxyzptlk : Kltpzyxm who?
Mr. Mxyzptlk : [realizes said his name backwards] Oh, nuts!
[disappears]