Is this really necessary?

One time in grade school, we were being taught how to spell words and "necessary" ended up being talked about quite a bit. The teacher said that if anyone missed it on the spelling test then that person would have to write it on the board fifty times (I think it was fifty).

Well, somehow I got confused and missed it. I was the only one. So I had to go up to the board and start writing "necessary" over and over again. After a while, the teacher told me that I could stop. I kept arguing with her that I wasn't finished yet, that I didn't have it written down enough times. She insisted, though, so I went back to my seat.

She was really a pretty nice teacher.