Me, I just sit there crammed into my seat, hoping no one sits in the middle seat. I always take the window so I can sort of lean towards it, and not get bumped by the beverage cart.
The worst flight I've ever had was when I was smaller than I am now, so I guess it's all in your perspective. This little old bat (forgive me, but she was!) and her husband sat down. She immediately started griping that I took up too much of her seat (which no one has ever said to me before or since). Her husband told her to lift up the armrest between their seats and scootch over towards him, but she said that wasn't the point. I spent an entire flight to Florida with her elbow on the armrest, jabbing me in the side every now and then. And complaining to her husband. Her husband apologized to me at the end of the flight for HER rudeness.
But, Danacara, if I had been in your shoes, I would have asked the flight attendant to move me. I'm sure there were other empty middle seats. If not, maybe she could have accomodated you in another class. I can never get over how inconsiderate people are.
Donna