My case was many years ago. But it saved me from embarrassment this week.
Long before I mystery shopped, I used to travel internationally for work. One time I had been on 4 continents in 3 days, with a lot of time in cultures that use a bucket, a hose, and a hole in the ground.
When I got off the plane in the US, the bathrooms were just across from where we de-planed. I thought Finally, a Western bathroom. Then I walked into the closest door, went in and did my business. While I was going out, a man came in. He looked at me and said You must be really disoriented. That's the first time I noticed it was a men's room.
Ever since then, I look at the sign on the door twice. This actually saved me a few times this week. In my neck of the woods, all the Chevron's have the ladies room on the right and the mens room on the left as you go down the hall. But I was shopping in another county this week and they were all the other way around. I can't tell you how many times I almost walked into the wrong room except for the fact that I checked the sign twice!!