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Somewhat like Godwin's Law, but instead refers to the fact that every popular YouTube video, no matter what it's about, will have at least one comment about Justin Bieber.
*Video of a talking cat advert from a few years ago*

Comment by:I_r_smurt:
OMG dis is sooooo fake!!! if u mad dis u r Justin Bieber's Boyfreind.

Me: I hate Bieber's Law so much...
by Roozler92 May 13, 2011
10 -1