Harry Styles: musician, hair icon, and now, resident grammar-corrector.

At a One Direction concert last week, the singer spotted a fan’s poster in the audience that read: “Hi Harry! Your so nice.” Styles called the fan onto the stage to both sign the poster and change the “your” to the grammatically correct “you’re.”

Maybe he was a copy editor in another life?

The sign-holder thanked Styles on Twitter, and the world thanked the sign-holder for making a One Direction concert go viral for something besides an unfortunate fall.

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