<P> In the late 1990s, Apple Computer came up with the advertising slogan "Think different" and produced a 60 - second commercial to promote the slogan . This commercial showed people who were able to "think differently", such as Albert Einstein, Mahatma Gandhi, Martin Luther King, Jr., and many others . It was later cut short to 30 seconds and altered such that Seinfeld was included at the end, whereas he had not been in the original cut . This shorter version of the commercial aired only once, during the series finale of Seinfeld . </P> <P> In 2004 Seinfeld also appeared in two commercial webisodes promoting American Express, titled The Adventures of Seinfeld & Superman . In these, Seinfeld appeared with a cartoon rendering of Superman, who was referenced in numerous episodes of Seinfeld as Seinfeld's hero, voiced by Patrick Warburton (character David Puddy on Seinfeld). The webisodes were directed by Barry Levinson and aired briefly on television . Seinfeld and "Superman" were also interviewed by Matt Lauer in a specially recorded interview for the Today show . </P> <P> On November 18, 2004, Seinfeld appeared at the National Museum of American History to donate the "Puffy Shirt" he wore in the famous Seinfeld episode of the same name . He also gave a speech when presenting the "Puffy Shirt", saying humorously that "This is the most embarrassing moment of my life ." </P> <P> On May 13, 2006, Seinfeld had a cameo appearance on Saturday Night Live as host Julia Louis - Dreyfus' assassin . Louis - Dreyfus in her opening monologue mentioned the "Seinfeld curse". While talking about how ridiculous the "curse" was, a stage light suddenly fell next to her . The camera moved to a catwalk above the stage where Seinfeld was standing, holding a large pair of bolt cutters . He angrily muttered, "Damn it!" upset that it did not hit her . Louis - Dreyfus then continued to say that she is indeed not cursed . </P>

How many years of college to be a comedian