Justin Bieber Goes Head-to-Head With Glass Wall, Wins

Justin Bieber's Entire Tour Sells Out in an Hour

Later in Paris, the Teen Superstar Serenades Fans on a Hotel Balcony: Watch

Justin Bieber has had a rough go of it in Europe this week. While filming a performance for his upcoming NBC special "Justin Bieber Believe: All Around the World" in Paris on Thursday, the singer passed out following a nasty run-in with a glass wall.

"I guess me and glass windows just don't work," Bieber joked to reporters following the show.

Justin Asks Mob of Norway Teens to Calm. Down.

Ever the consummate entertainer, the concussed singer returned to the stage to finish his set despite doctors instructing him to rest. After the concert, Bieber tweeted to his fans "just smacked my head and needed some water. all good."

As he alluded to in his joke to reporters, this isn't Bieber's first collision with glass dividers. In two notable YouTube videos, the Canadian icon can be seen slamming into barely visible glass walls without ever blinking an eye. "I will see u again Glass. I will have my revenge," he playfully tweeted later that evening.

The pop star will have to pay closer attention to where he walks on the North American leg of his upcoming Believe tour, set to kick off in Glendale, Ariz. on Sep. 29.

The tussle with his glassy nemesis proceeded an impromptu "Romeo and Juliet"-style concert from the balcony of his Paris hotel. Watch below as Bieber serenades fans from above, singing "Boyfriend" through a megaphone as NBC's cameras film the show.

His Parisian escapades follow closely on the heels of a controversial stopover in Oslo, Norway, where on Wednesday the singer caused a near-state of emergency with his visit.

He took to Twitter to ask fans to stay safe after swarms of teens clogged the streets of the capital in the run-up of a mini-concert atop the Oslo Opera House. According to reports, nearly 50 young girls were injured throughout the day and the mayor, Fabian Stang, admitted having to hide behind a tree to avoid being trampled.