This on cheese on toast.
Last time I flew there was a French family (mother with two kids) directly behind me in the queue to board the plane. Older kid was a boy about nine years old, and he was screaming the house down about having to carry his own bag (a little backpack for in the cabin). Mother dearest is completely oblivious to the fact that it's not on for a kid to make such a bloody racket and just absently tells him every few seconds to stop being silly, to absolutely no effect. I turned around and bellowed "Shall I carry that heavy bag for you?", took it off of him and turned my back. Little fecker shut up immediately.
When we got to the cabin door, I turned back to him, handed him his bag and said "Gentlemen carry their bags without whining." Mrs. Tree was mortified, but admitted she had expected me to kick him.