Fat people should have to purchase a second ticket. I can't stand people who can get up our of their seat without grabbing the back of your seat so your head is jerked back.
And don't get me started with the obnoxious ones who read some tip somewhere about putting their carry on luggage in the front of the plane even when they are sitting in the back.
Or they try to bring on a 70 pound carry on the size of a side of beef and to save $20 and then complain loudly when they are forced to check it. Or the people who bring on some stinky take out food and smell the whole plane up.
Or the ones who travel once a year and have to act so obnoxious like buying a ticket gives them all of these special rights to be a jerk.
Once on a cross country trip I had a window seat next to an enormous, sweaty, smelly person who proceeded to fall asleep, lean on me and crush me into the side of the plane! I was trapped for five hours. I couldn't even use my arms.