Blastr.com wrote a quick article about 15 of their favorite Science Fiction cameos. A cameo is a brief appearance of a known person in a work of the performing arts. An actor needs not fill such a role: short appearances by film directors, politicians, athletes, and other celebrities are common. [Wikipedia].

They’re short, they’re sweet, and they usually feature an actor or celebrity as never seen before. With movies like Iron Man (2008), Thor (2011), and most recently X-Men: First Class (2011), cameos have become the norm. However, not all cameos are created equal: The best cameos are often those in which real people play themselves on screen, making it a huge surprise for the audience when they appear. Cameos don’t need to be ironic or funny to be memorable; they just need to be innovative and surprising.
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