Discipline

The man clearly had attitude.
“I’ll count to one hundred and then it’s all over for you!” he threatened.
“But I’m only nineteen, or at least I was.” I countered.
“Mark my words, young man, you can't go wasting your opportunities by giving me your excuses! You’ve already reached halfway.”
Realising I was well on the way to being out for the count, I decided I had to do something really imaginative but I was struggling to find a bon mot, an expression, a phrase that might be my crowning glory, the icing on the cake, the cherry on STOP!