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There's plenty of things that are Turing Complete but that shouldn't be used for interactive applications.

http://en.wikipedia.org/wiki/Brainfuck

http://en.wikipedia.org/wiki/Template_metaprogramming

http://en.wikipedia.org/wiki/Turing_machine

and now apparently HTML + CSS




Model railways are turing complete.

http://www.monochrom.at/turingtrainterminal/pictures_eng.htm

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Is it not possible to write a C compiler that outputs Brainfuck code that can be executed inside a Brainfuck interpreter?

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