Tandem bike. This reminds me of the old song.. 'Sadie, Sadie give me your answer do. I'm half crazy all for the love of you. It won't be a fancy marriage. I can't afford a carriage. But you'd look sweet upon the seat of a bicycle built for two.'
In 1817, Karl Drais, a young inventor in Baden, Germany, designed and built a two-wheeled, wooden vehicle that was straddled and propelled by walking swiftly. Drais called it the laufmaschine or “running machine.”