I'm typically sympathetic to POS. The one time I felt frustration towards a POS was when I sat in exit row window, and clearly the woman was POS, sat in middle seat, and proceeded to bring out a seat belt extender. She then proceeded to proactively hide the extender under some clothes so when the FA was giving us the briefing, the FA couldn't see it. I considered making a note of it to the FA but figured it was not worth aggravating someone over it.