One wet weekend in late 2015, I had an idea to make a "The Price Is Right" style game for the internet. I grabbed 2 mates, a designer and a developer, and we had an MVP done by Sunday evening.
The site pulls in YouTube videos from a secret playlist and detects the view count. It then displays the correct total and generates 3 incorrect ones. Players watch the video and make a guess before moving onto the next one.