Defiant nine year old when asked to get in the bath:
"Make me" (I can still see the challenge in his eye)
Still just strong enough to pick him up fully clothed and drop him in.
But the best one was a friend of mine who was so tired of the bickering that went on between the children when they got home from school about what they were going to watch on the telly...............
She marched in, unplugged the telly, cut the plug off with a large pair of scissors, put the plug in her pocket and marched out again.