Your boss yells at you so you go home and yell at your wife. Your wife is a teacher who yells at her student. That student is the child of your boss so because of being yelled at throws a temper tantrum at home which aggravates your boss who started the circle by yelling at you. It continues to repeat creating the circle.
From Barney on "How I Met Your Mother"
You can justify yelling at someone if you were yelled at by referring to the circle of yelling.
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