Wouldn't it be funny if there ended up being a plastic-based life form and they wondered how they came to be...
...and they COULD NOT think of a natural process that could produce plastics in the environment in the amounts required to produce life?
Their science would never dream of how it happened.
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Plastic is defined by the fact that it's not biologically produced, but if you remove that qualifier there's tons of existing items that should qualify.
Not a chemical engineer, but think along the lines of latex/rubber/etc.