[edit] There was a real case where someone's YouTube video was sent a takedown notice because the name of the video was the same as the name of a copyrighted work, even though the content was completely original and had nothing to do with the copyrighted work.
[edit2] Part of the issue here is that it's hard to get rulings against large corporations over crap like this unless I can state to the court that I lost $X-million in revenue due to the content being taken down. If I'm a home user that put a homevideo online just to share it with the world, I apparently have less rights that the corporation that sends out 300 DMCA notices/day.