A few years ago I flew three consecutive flights - IIRC, two international (in J) and one domestic (in F) next to the same guy. Now, being on the same flights was not so unusual, I guess. But sitting next to each other all the way was out of the ordinary.

Nice guy (good thing!), but under the circumstances unlucky to be sitting next to me. I started coming down with a cold just as I started traveling, so I did my best not to talk to or even face him in order to try avoiding spreading the germs. I'm by no means sure that my strategy worked.