Whenever I see a kid running in the halls at school, I get real excited and ask them, "Hey, is your teacher givin' out free donuts today!?" They usually say, "No" or "I don't know".
That's where I tell 'em, "Well, you don't need run, then. You only need to run if your teacher is givin' out free donuts. You know how to tell when she is givin' out free donuts?-- Well, you'll see me runnin' too!"