I've had trouble with this one. I wanted to use the retort 'I know you are but what am I'. That takes me back to childhood. It seems especially funny in response to an accusation of being childish. Some kind of punchline was harder to find. I've gone for the childishness being infectious and Maureen overturning the board in a petulant frenzy. (Thanks Frank Zappa for that excellent phrase.)
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Maureen: You're so childish.
Crow: I know you are, but what am I?
Maureen: (overturns board) I'm not playing the stupid game any more...
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Use this code to embed the cartoon above if you like:
<a href = "http://handspinner.co.uk/yvonne/155.html" target = "_blank"><img src = http://handspinner.co.uk/images/scrabble4-1x.png srcset = "http://handspinner.co.uk/images/scrabble4-2x.png 2x" alt = "Crow has spelled out a rude message about Maureen on the scrabble board. She has a dark look: You're so childish. Crow: I know you are, but what am I? Maureen overturns board and stomps off, saying: I'm not playing this stupid game any more." title = "Immaturity is infectious"></a>