"You guys nuts, I no believe" shouts Ali as he storms off.
A few weeks later he asks again and receives the same reply. He says "Really ?, I do not believe." to which the shepherds say "we have all done it."
The next night shortly after dinner Ali sneaks off to the the far edge of the herd, and thinking himself to be alone, forces his affection upon a sheep. Before finishing, he sees the three shepherds on a nearby ridge pointing at him and laughing hysterically.
He leaves his four legged friend and charges the still laughing arabs while shouting "by the sword of allah I will have your heads for tricking me !"
When he reaches with fists clenched the shepherds who are now crying and rolling on the ground from laughing so hard, Mohammed says "No, we all really have done it, you just picked the UGLIEST SHEEP in the whole flock !"