YouTube’s Most-Watched Videos of 2015

With 2015 grinding to a close, Youtube takes a look back at the calendar year, via its annual "Rewind", showcasing the year's most-watched videos.

"Celebrating the videos, people, music and moves that made 2015," the 6 1/2 minute clip includes dance crazes, lip syncing, an epic plastic ball fight and even an Avicii remix, as well as Adele's record-breaking "Hello" music video, which racked up 665 million views.

Are any of the videos your favorites?