The USC Trojans have one of the most iconic uniforms in all of college football, so if they made any drastic changes to it, the fans would probably freak out. The Trojans know that, and they used that fact to their advantage.
The Trojans' official Twitter account tweeted out a picture of the team's "new" helmet. Fans were probably relieved to see "#KIDDING" on the photo.
As it turns out, every Pac-12 team had a white helmet for the conference's media day.