There is a small pizza place here in town. While the Chinese generally have no idea how to do a pizza, this one is better than most and bearable when I'm really too tired to cook. However, like every other such place they throw c*rn into every pizza. There I ask them to omit it, because I know they are going to assemble the thing to order right in front of me and missing a listed ingredient is not going to interrupt the flow of their service.
One time, I found myself unhappily in Pizza Hut - not my idea. I requested Pizza No. 21, but without the c*rn. No can do! Impossible! That's when I remembered that Pizza hut's 'pizzas' are pre-assembled in a factory hundreds of miles away and shipped frozen to the individual restaurants.