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8. YouTubers Playing The 7 Second Challenge App!

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We are crazy, crazy, crazy about Dan and Phil. We just can't get enough of them and this has got to be one of the very best YouTube videos ever to be uploaded. Not only does it feature Dan and Phil and their incredibly funny Seven Second Challenge game, but it also has a whole host of other mega YouTubers.

These include the likes of Anthony (from Smosh), Benny Fine, Brandon Bowen, Carrie Hope Fletcher, Catrific, Chris Kendall, Dan Howell, Dean Dobbs, Felix (PewDiePie), Grace Helbig, Hank Green, Hannah Hart, Ingrid Nilsen, Jack Howard, John Green, Louise Pentland (Sprinkle of Glitter), Mamrie Hart, Markiplier, Marzia, Mitchell Davis, Phil Lester, PJ, Rafi Fine and TomSka.

They are all shown doing silly little challenges, telling romantic stories about dogs and cacti, naming three things that will be invented in the future, trying to put one of their legs behind their head, and saying three things that they wouldn't say in front of their grandparents, amongst other zany challenges.

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