Do NOT try to reprimand your misbehaving class while there is (unbeknownst to you) a huge chunk of chocolate stuck to your front tooth.
They will not take you seriously. Neither will your co-teacher.
No, really– your co-teacher and 27 nine-year-olds will laugh at you for 10 solid minutes, and you will lose all credibility.
But then, luckily, you’ll remember that you never truly had credibility.
And that will make you feel better.
Until 10 seconds later, when you realize how sad that is.
Just swallow your chocolate, ok?