In the latest “YouTubers React” video from The Fine Bros, some of YouTube’s finest and funniest are challenged to watch hilarious videos without laughing or grinning.

In a competition between Brittani Louise Taylor, Shane Dawson, iJustine, Hank Green, Harley Morenstein, and more, find out who is unable to hold in the giggles and who just has no soul.

How far did you get without laughing?