I'm not sure of the name for what you're talking about, but the most prominent example I've heard is from people who work with kids (teachers, life guards, etc)

I'm not sure of the name for what you're talking about, but the most prominent example I've heard is from people who work with kids (teachers, life guards, etc). Instead of saying, "don't run!" you say, "walk" for the reasons you mentioned. I frigg'n hate those credit card machines that beep and blink "do not remove card" using the same font and sound as the other messages.