Many years ago (15) I was on the Paris to Washington DC flight on an airline I forgot. I seated myself on an aisle seat; a Vietnamese woman and her child were seated next to me. She was chatting with her husband who was seated behind me. The husband approached me and said that he wanted to be seated with his family and asked if I would mind switching seats. I gladly obliged thinking nothing of it.
Once I moved to his seat I realized why he wanted to switch – the little girl who was seated behind him liked to kick the seat in front. For the next six hours I was subjected to periodic kicks and no amount of complaining could convince her to quit. Her mother just ignored my complaints and there was nowhere else to switch seats. Moral: look before you leap!!!