Stanford Cardinal fans cheer against the Pittsburgh Panthers in Stanford, California, on Saturday. Eakin Howard/Getty Images

It’s a craze sweeping college football stadiums around the nation.

Bare-chested men, twirling their shirts over their heads. Hundreds of them. Thousands of them in places.

It started during another dismal loss in a dismal year for Oklahoma State. The viral images from “Section 2-No-Shirty-1” inspired legions of copycats. Colorado, UCLA, Utah, Clemson, Indiana, North Texas, Iowa State and more.

With the calendar flipping into November, there’s no sign that the shirts are going to stay on for the rest of the season. And it all started with a bet that turned into a viral moment.

Oklahoma State fan Trent Eaton told USA Today that his sister said she’d give him $

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