Bingo!
I'm a big guy - 6'6" and only 240 lbs. I get very verbal right off the bat when a fat one wedges their butt into the next seat.
The routine is the usually the same - they wedge in - my arm rest gone - leg into my leg space, etc. I then ask them why they did not buy two seats, "because obviously you can't fit into one." I get nasty, "if their is an emergency, please expect my my foot prints on your fat ass as I climb over!"
Here is my take - if you got a fat ass - defined as spilling over into the next seats space - further defined as when you set your double wide butt down your arm is now over the arm rest and into the next seats space - you need to buy a another seat. I'll be the first one to tell ya that.
Fat people have rights, too. The right to buy two spaces and not crush the passenger next to your ass.
LVM