Mulla was out in the desert, randomly digging holes. A passerby asked, "What are you doing?" "I buried a stash of money out here, and I can't find it," Mulla said. "Well, didn't you leave a marker?" "Of course I did!" Mulla replied indignantly. "When I buried it, there was a cloud casting a shadow right over the exact spot. But now I have no idea where it went!"