The Water Gun Knife: How You Cut 9 Million Pounds of French Fries a DayAndrew Tarantola6/23/11 12:10pm76EditPromoteGo to permalinkMcDonald's sells about 9 million pounds of fries a day. French fries don't come out of the ground that way. You've gotta cut them. How do you cut 9 million pounds of fries a day? With a water gun knife.