Footage was leaked today of Justin Bieber performing at a Sacramento concert – he was in the middle of telling his audience how much he loved them, when he was nailed on the head by a water bottle. He was a good sport about it, acknowledged that it hurt and kept the show moving. What compels people to throw thangs at artists, though?!

Watch the video after the cut.
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"Justin Bieber gets hit in the head by a water bottle on stage"