I believe I am the only person anymore to call the bathroom “the head”. Since I’ve been very much into ships lately, I’ve even gone a tad further than most, and now the bathroom/restroom/lavatory/facility is called the head. You would not believe how many confused looks I get when I ask to use the “head”. Then I tell those who aren’t in on the term “the head” what I mean. The bathroom. I love that term!