At the end of this choreography reel, the choreographer, Ryan Kasprzak, says, "thanks for downloading!" Excuse me, but I didn't download anything.* Did you just start using the internet yesterday?
* In the case that you also started using the internet just yesterday, and you're confused, he should have said, "thanks for watching!" If you want to get technical, I actually don't know whether when watching YouTube videos, you're streaming or downloading, but the truth is it doesn't matter: certainly, "downloading" is not colloquially applied to describe watching YouTube and thus "thanks for downloading" sounds dumb.