A neighbor came to Mulla's door and asked to borrow his donkey. Mulla lied, "I'm really sorry, the donkey isn't home right now." At that exact moment, the donkey let out a massive, deafening bray from the backyard. The neighbor frowned. "You just said the donkey wasn't here, but I can hear it braying!" Mulla glared at him. "You are an incredibly stubborn and skeptical man. You'd rather believe the rear end of a donkey than the word of an old man with a white beard?!"