Mulla Nasrudin

What is real evidence?

    A neighbor called on Nasrudin.
   ‘Mulla, I want to borrow your donkey.’
   ‘I am sorry,’ said the Mulla, ‘but I have already lent it out.’
   As soon as he had spoken, the donkey brayed. The sound 
came from Nasrudin’s stable.
   ‘But Mulla, I can hear the donkey, in there!’
   As he shut the door in the man’s face, Nasrudin said, with
dignity: ‘A man who believes the word of a donkey in pref-
erence to my word does not deserve to be lent anything.’