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This week General Motors - that giant, po-faced car-producing arm of the US government - revealed that it does in fact have a rollicking sense of slapstick humour. The proof: the EN-V ‘future urban mobility' concept.

This bizarre battery-powered device was developed with help from Segway, another answer in search of a question. Like the Segway, it uses bewilderingly complex gyro-sensor electronics to balance on just two wheels. They're arranged side-by-side, not fore and aft like other two wheelers.