make sure

The factory foreman inspected the shipment of crystal vases leaving the plant, and approached his new packer. He put his arm around the man’s shoulder and said,

“Well, Ole, I see you did what I asked. Stamped the top of each box, ‘This Side Up,

Handle With Care.’”

“Yes sir,” the worker replied. “And just to make sure, I stamped it on the bottom too.”