Why do videos of people playing with toys get so many views?

There are a lot of videos of people playing with toys, and some of them get hundreds of millions of views!

Some of the most viewed channels are just hands unboxing toys, like FunToyzCollector, and there are some channels which show kids playing like Ryan ToysReview.

The kid part of youtube has some weird things, nursery rhymes, car washing videos, playing with toys. In the video, the how and the why of these videos getting so many views is explained.

Article about FunToyzCollector and search engine optimization: http://rankwatch.com/blog/how-funtoyz-collector-became-a-youtube-phenomenon/

Blogpost from youtube of youtube kids: https://youtube.googleblog.com/2015/02/youtube-kids.html

Best/Worst videos: https://www.youtube.com/playlist?list=PLcXUkRPGzNHyTHrJpqnmaCwaicf7LymyT

Random Walk: https://en.wikipedia.org/wiki/Random_walk