A childhood belief about teachers

I remember in the 2nd grade, the other kids would go up to the teacher and ask her a question and go through a door at the back of the room, and stayed gone for a few minutes and come back. I had no idea what they were doing in there or for that matter what they were asking the teacher. Curiosity got the best of me, so, I got in line behind a kid to ask the teacher what was behind the door. At the last minute, I heard, or thought I had heard the kid ask, "May I go to the register room?" I had no idea what a "register room" was, but, being a curious 2nd grader, I asked the teacher if I could go to the "register room". Well, apparently the teacher didn't listen past "may I go..." so, she said yes. Elated, I went to the back of the room, finally I was going to get to see what was behind that door that all the kids wanted to go through. I opened the door, and all I saw was a sink, mirror, and a toilet. Well, I didn't need to use the "Rest Room", so, I just went in there, and thought, "Rest Room, that's what those kids were asking... Rest Room... May I go to the Rest Room, NOT the Register Room." Well, I felt pretty stupid, but, at least, now I knew...