Justin BieberEurope has been a bit rough for boy wonder Justin Bieber on his promotional tour. It was just a few days ago that he got into a crazy brawl with the paparazzi, then there was the insanity of the crushing crowds in Norway, and now tonight he was knocked out cold -- as in unconscious with a concussion -- during a performance in Paris.

Don't worry, no one laid a finger on The Biebs ... except The Biebs himself. According to TMZ, the singer sort of uh, ran into a glass wall during the concert. Don't laugh -- things got serious!

"Then it really hurt," he told TMZ. He pulled it together long enough to finish his performance even though he felt dizzy, but when he went back stage he actually passed out on the way back to his dressing room for at least 15 seconds. Doctors diagnosed him with a concussion and told him he needs to rest.

He also might want to think about glasses, as this isn't the first time he's had a little run-in with the clear stuff. If you remember a couple of years back, he ran into a revolving glass door.

Fortunately, The Biebster has a sense of humor about the whole thing. "You've got to laugh at yourself sometimes," he told TMZ. "I guess me and glass windows just don't work."

He also Tweeted: "i will see u again Glass. I will have my revenge. BIEBER vs GLASS. MGM LAS VEGAS 2013. lol. #GottaLaughAtYourself,"

I'm thinking there's a promo deal with Windex here somewhere. Or at least a lesson: People who live in glass houses shouldn't invite Justin Bieber over.

Here's Justin explaining this most recent glass scare himself:

Have you ever run into a glass window or wall?

 

Image via iloveJB123/Flickr