Donkeys donot eat mangoes

Hakim Raziuddin,an intimate friend of Mirza Ghalib didnot like the taste of mangoes.One day he was sitting with Ghalib.The street was covered with mango peels.A donkey passing through the street stopped for a time,sniffed at the peels and went on.
On seeing this,Hakim remarked with a smile,"Look mirza, a mango is such a thing that even the donkeys donot eat".
Ghalib calmly replied,"Yes sir, no doubt the donkeys donot eat mangoes".