I don't think I ever realized how many times I use the word "don't" in a day...
Don't run. We walk our feet.
Don't pick your nose. Use a tissue.
Don't hit. We have nice hands.
Don't climb that. Keep your feet on the ground.
Don't put that in your mouth. You could choke.
Don't put your hands down your pants again. Thats gross!
Don't stand on the table. Our feet stay on the ground.
Don't be so loud. Use your inside voices.
Don't touch that. It'll hurt you.
However, I guess when you spend most of your day with a bunch of 2 year olds, those are normal phrases.