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A group of contestants is challenged to perform a number of terrifying and/or disgusting stunts, from driving a dangerous course to eating something really nasty.
Love 'em or hate 'em, these iconic reality shows have made the genre what it is, and created literally hundreds of spin-offs between them.
These competition reality shows bring in - or once brought in - millions of viewers every week; why not see what all the fuss is about?
The undisputed king of reality television, MTV, has brought audiences some of the biggest names in the genre: 'Pimp My Ride', 'Cribs', and 'Super Sweet Sixteen', to name a few.
Classic American institutions such as Jeopardy are joined by more young gun quiz and game shows, on this list that will have you screaming answers at your TV.
Whether the physical challenges these shows demand are physically trying, or just plain gross, contestants must suppress all qualms in order to come out on top.