The Harley Davidson armoured sidecar of the Danish army.

"The Danish goverment between the wars was not generous with any military budget. So the army came up with the idea of "The Armored Motorbike". The Swedish factory Landsverk AB built the armor to the drawings made by the Danish army, and it was put on top of a Harley Davidson armed with a light machinegun. This was more than even a Harley could cope with. It was difficult to control on ordinary road, and a 3x1 vehicle with overloaded suspension wasn't impressive in terrain. It was decided to abandon the project. However, Danish motorbikes knocking out German armored cars and light tanks shows, the idea wasn't totally without merit. This was built 1932 and and dropped in 1935."

-Source