I had a student who was very quiet, you couldn’t even hear her when she talked, if she said anything at all that is, which was unusual. One day, she brought candy during recess, and right after that, it was time for my class.
All the other students asked her for some candy and she shared it with them. Finally, she was almost out of candy and her classmates insisted that they wanted more. She suddenly lost her cool and a bad word came out, loud and clear.
I couldn’t help myself so I started laughing. No one was surprised by the word itself, but by the fact that she had finally said something.