There is nothing which cannot be answered by means of my doctrine," said
a monk, coming into a teahouse where Nasrudin sat.
"And yet just a short time ago, I was challenged by a scholar with
an unanswerable question," said Nasrudin.
"I could have answered it if I had been there."
"Very well.  He asked, 'Why are you breaking into my house in
the middle of the night?'"