There was a post on Reddit a while ago about how someone couldn't watch the livestream of their brother's graduation because the organist played a section from the Star Wars theme. Youtube's automated filter caught that it was a copyrighted work and blocked the entire livestream.

To copyright holders nothing is insubstantial. Playing 6 notes from a song is enough to be considered infringement, apparently. There are countless stories of things like people uploading family home videos with the radio playing in the background that get taken down. Copyright enforcement has gone way too far!