So here's a question. When you are sharing an armrest with someone, whether it's in an arena, a movie theatre, or on an aircraft, which armrest is yours???

I've always been told that when you are sitting in a seat with shared armrests, you always take the right armrest as yours. Which basically means if you have an aisle to the left of your seat (or if you sit on the port side window seat of an aircraft) you get both armrests.

Have any of you ever heard what the protocol is for armrests??? Just curious.