Originally Posted by
bocastephen
Less of a risk if you do aisle-middle because you can block anyone from sitting, but if you're in the window, be prepared to either wait in the middle until the door closes, or slide across quickly.
I just had this dumb idea while reading this. Print a paper boarding pass for the empty seat and just lay it on the empty seat. If anyone comes up to take the seat, hold up the boarding pass and say, "I don't think your boarding pass says 10E, because I have it right here."