On a small flight ... seating is 1 seat on the left and 2 on the right (if relevant)
Walking to my seat and was held up by a woman putting her baggage away. I wait patiently. She turned to me and apologised and I smiled and said it was ok.
She finally got her bag in and then threw her handbag down on the seat next to her and sat down.
I then apologised to her and said that was my seat (the one with the handbag on) she then tutted and rolled her eyes as if I'd done it on purpose 
She stood up and banged her head, which probably pissed her off more.
She then couldn't move from her seat fast enough to move into the single seat opposite after take off. Then when we landed she seemed to purposely block me from being to get out of my seat by standing in the way of the aisle when there was plenty of room for her to move up.