''A monk asked Joshu, "Does a dog have the Buddha nature?" Joshu retorted, "Mu!" ''

http://www.catb.org/~esr/jargon/html/M/mu.html
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Thank you (I feel like I just got hit by the proverbial monk)
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Is Joshu a cow?

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Knock, knock.
	 :	Who's there?
Interrupting Buddhist.
	 :	Interrupting Buddhi...?
'''Mu!'''
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See also MuAnswer.