The other day, @NatalyaD introduced me to the term #DisabilityDongle. Now I've just encountered #Gadgetbahn. And of course I'm well aware of the annual attempt by an eager design student (and occasionally Sir Clive Sincliar) to revolutionise the bicycle without any of that troublesome research. (Though that doesn't seem to have a specific term.)

Is there a general term for these kinds of #ImpracticalInnovations? Or do you know of one from another field?