On a BA 777 flight from Denver my wife was sitting in the centre seat of three. As soon as she sat down one side of the hinge collapsed and that side reclined so the seat back twisted. The CC jiggled the seat back until it seemed ok.
On take off the seat collapsed again so, as soon as the seat belt lights went off, we summoned the CC again. The third seat was occupied by a very tall man who had probably booked an aisle seat. So that we could stay together, they tried to move him to the only vacant seat which happened to be in the centre of another row but, when we pointed out his long legs, they went to extraordinary lengths to shuffle people around so that he could have an aisle seat.
We ended up in the happy situation of having three seats to ourselves. I thought that the CC handled this situation really well. I did suggest that the problem could have been solved by giving me a jump seat up front, something I used to do frequently before 9/11.
