Recently, when Sam is mad at me for telling him he can't do something or for sending him to his room as punishment for something he will say, "You're not my friend anymore, Mama!"
Ouch! I never thought that would hurt, but it does. Being the Mama I say, "I'm sorry you feel that way, but it's not my main job to be your friend. Sometimes I have to do things you may not like and that's that."
As Richard says, "We skipped the "terrible twos" and went right to the F!@#$%* FOURS!"