Originally Posted by joeyrukkus

95% of the time people just accidently sat in the wrong seat.
4% of the time it's a couple or family that have a genuine reason to ask politely if you wouldn't mind swapping so they can sit next to their kids.
1% of the time you gotta tell some dill weed that you booked the seat you wanted and aren't willing to sit in the middle seat in the back of the plane just because they didn't feel like enduring that torture themselves.