Justin Bieber's fans may be quick to mob anyone who criticizes him, but after he showed up a full two hours late for a performance in London -- on a school night, no less! -- all those Beliebers turned their poison arrows on him instead.

Justin was allegedly slated to appear at 8:30 p.m. on Monday, Feb. 4, but he didn't arrive until 10:30, by which time the fans had started flipping over police cars, looting stores and throwing Molotov cocktails into orphanages.

Okay, they didn't do all that, but they did boo a lot. (Choose your own adventure, we say.)

His tardiness annoyed concertgoers with a curfew, seeing as the show was on a weeknight and the majority of Bieber fans aren't allowed to drink -- even in the UK where that's permitted at 18 -- much less stay out past their bedtimes.

Bieber tried to rectify the situation via Twitter by saying he was really only 40 minutes late, but even that wasn't within his control:

His math reminds us of how we justify buying something that's on sale but still too expensive. "No, look! It's half-off. So when you think about it, and divide by four and carry the one, I'm really SAVING money here."

Regardless, this isn't the first time the Biebs has been booed -- and it likely won't be the last. Such is fame with a fan base that has homeroom bright and early.

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