From Quora:
Back in the late ‘90s, on a continental U.S. flight, I had this happen to me, and sure, I could have spoken to a flight attendant - but I liked my plan better.
My flight was underbooked, so I sat a couple of rows behind the Karen to keep an eye on her.
About 30 minutes into our two-and-a-half-hour flight, she got up to use the lavatory. Once she was in, I moved to her seat.
When she came back, she told me to get out of “her” seat. I showed her my ticket, proving it was actually my assigned seat, and told her she must have gotten confused after returning from the lavatory.
She called the flight attendant, and when she was done making her complaint, the flight attendant asked to see my ticket.
I showed it to her while pointing at the assigned seat number, and I mentioned that the lady appeared to be confused and lost when she was walking back from the lavatory.
I suggested that she may be experiencing a medical emergency, and they said begging her to the back of the plane, so they could more easily monitor her condition.
The seat- swiping passenger became irate, and would not calm down..or even sit down for the rest of the flight - despite protests from flight attendants, she even stood during landing
There were police waiting for her at the gate when we deplaned.
I had a connecting flight to catch—otherwise, I would’ve stuck around to see if she ended up in handcuffs. }}
intersct