Go to a party with confidence, dress neatly and feel refreshed, but the breeze blows your hair a little messy. Just as you are about to push through the door, a mirror at the door makes you terrified, feeling that your clothes are messy and your hair is like a bird's nest. Suddenly, it seems that all eyes are staring at you, and all whispers are talking about your "unlucky appearance". You're nervous, even though it's not. This is what psychology calls spotlight effect.