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A kid yells this when they're so sick of hearing the same stupid thing again and again and being bossed around by someone who thinks they're in charge.
'I know, I know!' yelled at the top of their lungs after the teacher said 'sit down' for the 10th time.
'I know, I know!' shouted as the parent tried to explain the same math problem for the 5th time.
'I know, I know!' screamed when the kid's little brother started singing the same song again.