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A facial filter is when your face betrays you before you can say a word. It’s like your face has a mouth of its own and it’s screaming your secrets.
My boss walked in and I blurted out 'I hate Mondays' before I even had time to think.
My mom saw my report card and my face turned into a tomato before I could hide it.
I saw my crush and my face did a full-blown happy dance without me even trying.