Jimmy Fallon’s time at SNL was marked by a few memorable characters, a lot of boyish charm, and an epidemic of uncontrollable giggling. His most consistent bit was breaking character, often taking the entire sketch down with him in a fit of laughter. This maddening habit somehow endeared him to audiences, who saw it not as unprofessionalism, but as genuine fun. He parlayed this affable, non-threatening energy into a hosting career, first with Late Night and then The Tonight Show, where he gets to play fun games with celebrities and laugh as much as he wants, without Lorne Michaels glaring at him from the wings. Highlights on SNL? Fallon performed a few excellent impressions, and did okay work with Tina Fey on Weekend Update for a while.