I think this is really what you should have in your personality to be able to teach younger kids that don't really know how to treat others. This is what they should look at everyday and know that is what you expect from them.
Instead of I don't know... Gotta make this sign to use at the start of the school year!
[Free poster download] "The more that you read, the more things you will know. The more that you learn, the more places you'll go." - Dr. Seuss