I'm sure you know the feeling. You're sitting in your seat in the plane, watching passengers walking down the aisle, wondering who'll be sitting next to you. And hoping like heck it won't be ... the guy who looks as though he's been partying for a week or the lively group of children, or the huge jolly woman carrying half a dozen bags.
All of those types are found on most flights and I'm not sure which I'd least like to sit next to.
I do recall a flight to Australia where I was surrounded by out-of-control kids who if they weren't kicking the back of my seat were banging into my shoulder as they wrestled for some toy. That was an irritating experience. And possibly the most irritating bit was the parents' repeated cries of "Don't do that Dudley" or "I've told you to stop that Roxanne".
Another time, on a flight to the US, I had the window seat and the aisle was occupied by a delightful woman who was a bit too large for the allocated space.
We enjoyed a very entertaining dinner with plenty of wine and she promptly went to sleep. Very heavily. Unfortunately this meant that when I needed to go to the toilet I couldn't get out.