Far worse than the kid kicking your seat is the parent allows them to stand on the tray rest and slap your head and pull your hair - had that on an over night flight from KUL-LHR, and the mother (scum) couldn't give a damn that her child was doing it, despite my protests to her and the crew.

Her mitigation "he can't sleep and he's bored, I'm on my own and I fell asleep what do you expect me to do" - in the end she sent him off to go and play somewhere while the lazy %%^& went back to sleep.

I eventually fell asleep wondering whether, as we were on an international flight, she was committing any offence, allowing her child to slap someones head and pull their hair when she was in a position to prevent it