It's common for pro golfers to wear pins, buttons or ribbons on their hats and visors, but Phil Mickelson attached a binder clip to his black KPMG hat at this week Royal Troon.

Mickelson on the binder clip.

"Yeah, it's just to keep my cap on. I know it looks terrible but it is what it is" pic.twitter.com/xxXAJdiVuX

— The European Tour (@EuropeanTour) July 15, 2016

The clip even has its own parody Twitter account.

More from FoxSports