Per ESPN Chicago: Justin Bieber unwittingly committed a hockey no-no by standing on the Chicago Blackhawks' logo in their dressing room at the United Center, where he performed Tuesday night.

The 19-year-old Bieber, from Canada and a known hockey fan, was posing for pictures with the Stanley Cup, which the Blackhawks won on June 24. There was also a personalized Blackhawks jersey with Bieber's name on it in the background. But what upset some Blackhawks fans on Twitter was a picture of the teen pop star standing on the team's Indian head logo while he was taking his own picture of the Cup.

The Blackhawks, like most NHL teams, have an unwritten rule that no one is permitted to step on their logo in the dressing room. The logo is often roped off throughout the playoffs.

Players have been known to scold people for accidentally or purposely stepping or standing on it.

This is one of the very few things we have in common with Biebs, aside from our all-leather wardrobe and uncomfortable large clan of tween admirers.

We had no idea about the "rule" one time in the Wild locker room and planted ourselves on the logo before being scolded. Dumbest unwritten rule in the history of unwritten rules.