We see why people are concerned.

This video of Justin Bieber acting bizarrely while taking pics with fans in London is practically breaking the Internet, and a lot of people are pointing to it as proof that he must have a drug problem. We think trolls are getting a little ahead of themselves, but he does seem really off...

JB twitches and fluctuates between smiling and frowning while frantically rubbing the back of one lucky Belieber in the clip, and now rumors are swirling that the singer was exhibiting the tell-tale signs of meth use. We find it almost impossible to believe the "Sorry" crooner would dabble with such a dangerous street drug, so we're calling BS!

The Canadian heartthrob and his fiancee Hailey Baldwin moved on from London to Italy, where they are currently renting a $13K-a-night villa on the Amalfi Coast. They posed for pics with a couple lucky locals, glasses of wine in hand, and seemed totally normal.

Everyone needs to back off The Biebs and stop starting crazy conspiracy theories!