When somebody is a little bit wrong - say, when a waited puts nonfat milk in your espresso macchiato, instead of lowfat milk - it is often quite easy to explain to them how and why they are wrong. But if somebody is surprisingly wrong - say, when a waiter bites your nose instead of taking your order - you can often be so surprised that you are unable to say anything at all. Paralyzed by how wrong the waiter is, your moth would hang slightly open and your eyes would blink over and over, but you would be unable to say a word.