Leno only has two more Tonight Show episodes left to host, so George Mason University’s Center for Media and Public Affairs took it upon themselves to analyze all 43,892 monologue jokes Leno’s told on the show between its premiere on May 25, 1992 and the January 24, 2014 episode. What they found: President Bill Clinton was Leno’s most frequent monologue target with 4,607 punchlines at his expense, while other top butts-of-the-jokes included George W. Bush (3,239), Al Gore (1,026), and Barack Obama (1,011). They also found that Leno poked fun at Democrats 15% more often than Republicans, and while celebrities were brought up less often than political figures, O.J. Simpson led the celeb category with a total 795 jokes, followed by scandal makers Michael Jackson (505), Martha Stewart (208), and Paris Hilton (153). R.I.P. 90s jokes.