In Marine Corps basic training, I soon learned that everything we recruits used belonged to our drill instructor.  For instance, she referred to the stuff in our footlockers as "my trash" and to the racks where we slept as "my racks."

One time when when we were all whispering in the bathroom while making "head calls," our drill instructor must have overheard us.

To our surprise, she suddenly yelled, "Why do I hear voices in my head?"