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Why not have a temperature-sensitive coffee stirrer that changes color depending on the temperature of the coffee? Blue for too cold, red for too hot, green for just right. No more McDonalds lawsuits...or at least maybe no more scalded lips and tongue.
embadoc, Sep 13 2005
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http://www.designinsite.dk/htmsider/m1317.htmmaterials you'll need to build the straw ...
I don't think that some thermochromic materials are entirely safe for food contact, however as the website shows, having them incorporated into the container would probably do.
The idea of a portable, cheap (and disposable) add-on to disposable coffee cups means well but I don't think resolves much regarding the issue of people burning themselves with hot liquids. I think the issue has been solved by McDonalds by just printing the words "Contents may be hot". That covers your lawsuit. A more expensive stirrer with a changing color code would not stand out against the cheaper stirrers with only one color. It would have to be big enough to be read and understood as a semantic object, and then thrown away. It would be a nice temporary gimmick though.