Have you scolded someone publicly?

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I used to have this very weird high school student in my class who I know wants my attention and is obviously is trying to get it through becoming impolite in class. I tried to endure it for a while and tried to act nicely toward this student but came one time when my cup was already to the brim and him shaking the cup through his impolite way, there and then I exploded in front of all the students in the class and publicly scolded this boy.I felt it was already too much so if you want to mess up with me then know that I have limits too.He was of course dumbfounded on how a patient teacher turns out just the opposite.After doing it, I proceeded to the director's office and explained the reasons why I did such a show.Have you scolded someone in public too?How come it happened?