How Do You Write "No"?

During "quiet time" (sadly, naps seem to be fading out, but that's a different topic), Lizzy came out of her room and asked me, "How do you write 'no'? I'm writing a sign for Peter to put on the door to tell him 'No, Peter! You can't go outside until Mommy says so.'" I told her how to write it, then she taped it to the front door and decided to add "Peter" to it so he would know the sign was for him. Then Lizzy said, "How do you write 'Yes." I want to write a sign to put on the door that says "Yes, Peter. Now you can go outside." We wrote that sign then she said, "Now I want to write a sign for Lizzy that says, 'Yes, Lizzy. It's time for school.'" After all that work she said, "That's enough signs now. I'll do more work later." True to her word, more signs did pop up. Now Peter and mommy and daddy have "no" signs on our doors too. The problem with "no" though, is what are you saying "no" to? Is is a mean "no," or a nice "no"? Looks like now we've got to talk about not only talking nicely, but writing nicely too. I think I'll push for more "yes" signs. They seem a little nicer;)