One Direction star Harry Styles fell over in pain during a concert ... after a fan in the audience threw a shoe in the wrong direction.

The boys were performing a show in Glasgow on Tuesday evening and while they were taking a moment to talk to the crowd, the band's crazy fans started throwing sneakers at the stage.

While Harry managed to catch the first one that was thrown, the second one hit him square in the family jewels ... causing him to fall to the ground in pain!

After writhing around on the floor for a bit, Styles hopped back up, stretched out his groin and went on with the show.

Check out the hilarious video above. The hit happens at about :25. 

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