We prepared for our Sunday hamburger party and opened a bag of frozen fries. Not too uncommon. The local supermarket sells fries by the scoopful.
But this bag was special. Inside we found two packets of ketchup. Awesome, although not nearly enough for all the fries.
Apparently, two is the optimum number of packets needed for fries. When we order three large fries at McDonald's, we're given two packets of ketchup with our order. If we order one large fries, we get two packets. It's always two.