What's Inside? is a YouTube a channel ran by father and son duo Dan and Lincoln Markham. They are famous for cutting various things open and seeing what's inside.
The channel has more than 350 million video views, 3.5 million subscribers and have been on Youtube since 2008. Some of the things that they have cut open are: a MacBook, an electric bike, an olympic torch, a rattlesnake rattle, and even the Youtube Gold play button.