Not quite the same thing, but even more irritating is when FAs have problems with the doors.

On a recent LH flight, I stood outside a bathroom for about 20 minutes. It was "occupied" the whole time and no one came in or out. Finally a FA noticed, thought something might be wrong with whoever was in there, knocked, and when there was no response, she used her key to open the door.

It was vacant. Which means the FAs forgot to unlock the door after take-off.