A man and his wife are touring Egypt. While looking at the pyramids, a local merchant calls them over. He offers the man 100 camels in exchange for his wife. The man takes a few minutes, but ultimately refuses the offer and the two go on their way. A bit later the man's wife asks him, "What took you so long to say no?". The man replies, "I was trying to think of a way to bring 100 camels back home!"