Too cute for discipline?

These girls are in my "basic" level class, which is the youngest group of kids I teach. Two of the girls showed up with masks they had made in another class, and decided to wear them for the duration of the class. When I called them rabbit instead of by their names, the laughter was so uproarious that it took a good five minutes to calm the class down. I never really understood what was so funny, but they sure loved that joke.