Have you seen my mean face?

Two days ago one of my students was especially naughty. Not just a little disruptive, but in your face...terrible. Two other teachers had to talk to him about his behavior. So naturally when I got him back to my classroom without other adult witnesses, I had to ream him out.... I let the other kids go to their centers and then I sit this student down to let him have it. I am ten minutes into, what I think is a very scary and intimidating talk about behavior, when this little spawn of satan looks up at me and says " Miss Malenke are you almost done? I really want to go to a center now."

So now it appears that I am not even intimidating to 6 year olds. If I can't scare a kindergartener what good am I?

If you have any suggestions on legal ways to terrify small children please let me know.