I love how obesity is the last openly accepted prejudice... Perhaps we shouldn't let fat people fly at all. Put them on the back of a watermelon truck so they can gorge on watermelons the whole way... Well, scratch that. Fat people would rather eat chocolate.

Anyway, I digress. Where do you draw the line? As a morbidly obese person myself, (I am 5'11" and a good 315lbs) I don't hang over in anyones seat and the armrest goes down easily. I scrunch myself against the wall tightly so as to make sure that the skinny next to me gets the WHOLE armrest to themselves, and always they always seem to take both armrests on their seat for their arms.