Nasruddin and his donkey

One day , one of Mullah Nasruddin's friend came over and wanted to borrow his donkey for a day or two. Mullah, knowing his friend, was not kindly inclined to the request, and came up with the excuse that someone had already borrowed his donkey. Just as Mullah uttered these words, his donkey started braying in his backyard. Hearing the sound, his friend gave him an accusing look, to which Mullah replied: "I refuse to have any further dealings with you since you take a donkey's word over mine."