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 What about theme based games?  For example, discussing any single given topic (e.g., sunflowers) using automotive terminology in each sentence.  How about the bad prose competition? | 
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 Again, I'm thinking that "language game" isn't the right name for this concept--can someone research this?  The term is has a well-established meaning in philosophy, due to Wittgenstein, and I think in critical theory too. --LMS | 
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 Again, I'm thinking that "language game" isn't the right name for this concept--can someone research this?  The term is has a well-established meaning in philosophy, due to Wittgenstein, and I think in critical theory too. --LMS | 
I agree, if pig latin was used by the African American slaves, then it should not be called useless!
swiped this from wikipedia "Useless language" which is now redirected to this plural-named (sorry) page(s)