John Stamos Once Stuck His Thumb in Jimmy Fallon’s Mouth by Way of Saying Hello

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Jimmy Fallon is great at awkward first encounters with celebrities. Last year Nicole Kidman relayed a story of how she went on a terrible first date with Fallon, and now Fallon remembers his first time with John Stamos, where the Full House actor was with Bob Saget at a Paul McCartney concert and accidentally stuck his finger in his mouth. Did John Stamos's thumb taste as good as he looks, Jimmy?