If you didn't think l'enfant terrible Justin Bieber was already bratty enough, we have new evidence that may finally convince you: Earlier this year, he was caught on video (by an apparently easily-impressed friend) peeing into a mop bucket in the back of a restaurant. Because, you know, class.

"Wait? Wait? What do you mean someone is upset they have to clean that? That's prime Justin Bieber urine," we imagine him asking incredulously when someone got angry.

In the video, a security guard can be seen blithely ignoring the obvious health issue here -- not to mention Justin's ignorance of common human decency -- while a gleeful friend films the entire thing and provides running commentary.

"We swagger man, you know," an unidentified voice brags. "That's the coolest spot to piss, you know, you'll forever remember that." Which is true -- there's not enough bleach to forget that some jerk peed in that now useless mop bucket.

Someone can then be heard yelling, "We're the f--ing  Wild Kidz yo!" before Justin sprays a picture of Bill Clinton with Windex, yells "F-- Bill Clinton!" and runs off into the night. Probably to be a tool elsewhere.

The worst part? His fans will probably forgive him for this nonsense too.

Canada, we love you, but it's really about time you took this kid home.