I was in an old office building with 3 young ladies, all clients in their very early 20s. Two of the ladies went to get a snack. The third sitting next to me asked me what is that little room used for. it was about 3x3 with a small stool and bi-fold doors. I was shocked and asked her if she really didn't know. Then the other tow ladies returned and asked the very same question. Again, I asked if they really didn't know what a telephone booth was.