Have you ever heard of a walking machine made from bent wires and run by a single 1.5V AA battery wherein the motor and battery can rotate with crank?

Hackolog member brought this amazing concept, where you can build your own walking machine just by using fewer components.  You can start by connecting the motor to the crank to which the wheels are fitted. Now when the wheels meet an obstruction the motor starts driving the crank round, the spinning eccentric weight of the motor causes the robot to jump up and down and the foot oscillates. 

To get an idea how the machine looks like, you can refer to the pic below: