I have a new least liked thing at the top of my list (well there are two but one has been there a while). Copying, Mimicking, etc. The kids do it too each other, neither can stand it when it happens to them but think it is fun to do to each other.
I believe this activity was actually started by the Girl as she wants to be just like her big brother. The Boy is a sensitive type that doesn't like to bothered but doesn't mind one bit bothering someone else. It is an activity that grows old very quick as one child or the other can say copy one word and it becomes a crying mess.
They have yet to copy us, but if they do I will move to cleaning their stuff or maybe even throwing it away.