That Time I Couldn't Believe What Came Out of My Mouth

I know what you're thinking and no, I didn't swear again.

There have been countless days where I just have to shake my head at myself and think "I cannot believe that came out of your mouth" because of the extreme ridiculousness that happens in my classroom.  Here is one example:

Last year I had a particularly hellish class (there's always one) that liked to sag their pants. Typically I don't say anything about dress code violations because it makes me uncomfortable, but today was a bit different.  I honestly can't even remember how it happened, but the guys were joking about their sagging pants and trying to see who could get their pants the lowest and then suddenly there were pants hitting the floor.  I shut it down real quick, but I had to say "The next person who pulls down their pants in class is going straight to the office."

Why is that even a thing that needs to be said?