From Justin Bieber to Shawn Mendes, many people have kickstarted their careers on YouTube.
Now one man has used the site as a platform to show off the most impressive gadgets you'll probably ever see in your life.
Mark Rober is a former engineer for Nasa, having worked for them for nine years from the age of 24.
In 2013, he decided to branch out, creating his own gadgets and demonstrating them on YouTube.
And he's certainly gained a following by creating devices from a giant nerf gun, as you can see below.
...to a giant Super Soaker...:
...to a very nice car horn:
Amazing, aren't they? Check out more from his channel here.