Each of our children has a habit which I repeatedly ask them to not do (or to do). Andrew's is sucking on his finger. Apparently Peter is very accustomed to me telling Andrew to please take his finger out of his mouth. This morning in the van, he saw Andrew with his finger in the mouth and said, "Andrew, take your finger out of your mouth!". Everything is apparently much funnier when your enforcer is 2 years old!
We giggled about it for awhile, and then Matt taught Peter the phrases to say for the other kids (such as "Naomi, out your book down!).