The other day I got on an RJ in seat 8C and this lady comes up and accuses me of being in her seat (7C). Someone is already in 7C and this started a chain reaction - there were literally 6 people in the wrong seats in a 4 row area.
Then the guy next to me goes to the lav and another lady comes up and says "can I sit there?" and I say I am sorry but someone already has it. She cops an attitude and sits in 7A and tells the guy in 7B "I did not want to sit with him anyway"
What is so freaking hard about looking at your BP and looking at the sign on the row?
I am also ready to lose my patience with the "do you want the window? I don't mind" people. If I wanted a window I would not choose an aisle - get the F out of my seat.