The inventors of the tandem, Charles B. Tripp (a man without arms) & Eli Bowen (a man without legs) ehm, and rightly so...

come on, they were joking, really, the true inventor was a Dane, a certain Mikael Pedersen, here he is below with his girlfriend while (among doing other things for sure) he pedals...

Mikael Pedersen made a bunch of money inventing other things too, then he fell in love with a girl 29 years younger, a certain Ingeborg, but then he ran away to England at 60 years old, and there a friend found him after about ten years, surviving by selling matches, he helped him return to Denmark where he lived another 10 years and nothing... #chiaroscuro