"Steve," he says: "I'm building a fence the same size as yours. How many pallets of bricks did you get?"
"10," Steve answers.
So the guy buys 10 pallets and proceeds to build a beautiful fence. When he finishes, he's surprised to find he only used four of the pallets.
"Hey, Steve," he says over the fence: "I just finished building my fence, and I've got six pallets of bricks left over."
"Yep," says Steve: "So did I."