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That annoying voice in your head that yells at you like you're stupid, telling you you're missing something important, but you don't know what it is yet.
I was about to leave for my job interview when my brain screamed, 'You forgot your pants!' I didn't even wear pants that day.
She left the house thinking she had her keys, but her brain said, 'You forgot your keys!' and she went back and found them under the couch.
He was halfway to the airport when he thought, 'You forgot your passport!' and had to turn around and run back home like a madman.