So, when Nasruddin was caught carrying a knife - and it was a very big knife! - they took him to court.
"Why were you carrying that knife?" asked the judge.
"I need it for my work," replied Nasruddin.
"What are you, some kind of butcher?"
"No, I'm not a butcher. I'm a scholar. I use the knife to scrape off errors in manuscripts."
"Why such a big knife?"
"You wouldn't believe the size of some of these errors, Your Honor!"
Inspired by: Mulla's Donkey and Other Friends by Mehdi Nakosteen
Notes: This story is on p. 79 of the book.