As a ski instructor, I sometimes tease my little pupils. Once I told seven year old Luke that if my skis were faster than his, it was because I'd waxed them with butter.
The next morning his grandmother came to class with him. She took me aside and said, "We had no butter left for breakfast. Luke had spread it all over his skis, claiming that it was the proper way to wax them. I think you should tell the children that instead of listening to nonsense from other beginners, they should only take advice from their teacher."