There's nothing more exciting than watching one of your favorite TV shows and — surprise! — a huge star comes on the screen out of nowhere. Cameos have been a fixture of television series for decades and always make even a good episode just a little bit better.
Flip through the gallery below for a look at 15 of the most iconic television cameos, from Joe Biden's turn on "Parks and Recreation" to a controversial episode of "Friends" guest-starring Winona Ryder.
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