Youtube videos you keep going back to

Except for music, are there any videos on Youtube that you keep going back to.

I mean like 10 times or more?

Most things we look at once or twice and move on but it must be pretty good to keep going back. What is it and why do you watch it?

For me, there is one particular fitness video I watch a few times a week. It's a great workout and I don't get bored of it.