A smart aleck who wanted to make Mulla look foolish in public asked him, "Mr. Mulla, since you're so wise, where exactly is the center of the earth?" Mulla stomped his foot and pointed at the ground. "Right here, exactly where I'm standing." (Since the earth is a sphere, technically, any point on the surface can be considered relative to its center—making Mulla's bluff unprovable and hilarious).