"And I would've gotten away with it too, if it wasn't for you dancing kids." – Prince, who was not actually directly involved with this lawsuit but let's demonize him anyway.
In 2007, Stephanie Lenz uploaded a video to YouTube of her young children dancing to Prince's "Let's Go Crazy." It's about 30 seconds long, and let's be honest: it's cute, but the only reason it's appearing on this blog is because it now has long-lasting legal importance.
Unbeknownst to her, Universal Music Group had assigned a staffer the full-time job of protecting the online copyright claims of the artist currently known as the music industry's most inexplicable homophobe, Prince. This staffer would send YouTube takedown notices invoking the Digital Millennium Copyright Act (DMCA) for any clip using more than 1 second of a copyrighted song that wasn't drowned out by background noise. Standard practice.