It was at the beginning of practice three seasons ago when Steelers players say they knew trouble was coming.
Star wide receiver Antonio Brown appeared with two people in tow. They were part of Brown's new social media team and were following and recording him throughout practice.
Some veteran players were stunned. It wasn't just an unusual sight; it was unprecedented.
Brown's social media adventures would continue that winter. In January 2017, without Mike Tomlin's knowledge, Brown put the coach's postgame address to the team on Facebook Live, a video that left Tomlin answering unexpected questions about why he called the Patriots "assholes" days before the team was to play those Patriots in the AFC Championship Game.