From a couple of first grade boys:
Mrs Y - Girls are so confusing! They ask us to chase them then get mad at us when we do! What should we do?
Rather than say what I really wanted to say ("Oh honey - just wait) I put on my grown up hat and instead said "I'm so glad you stopped when they asked you to. Why don't you go play soccer?"
Hopefully they'll think about those words 10 years from now.