It sounds ironic but like the Maus Super Heavy Tank, these tanks are anything but massive, so they were aptly named Goliath! It is a type of remote controlled demolition tank invented by the Germans during World War 2. They were designed to be steered by remote onto an enemy tank or a strong-point and to be detonated upon contact.
Just to prove a point that anything can be turned into a weapon of shock, awe and destruction. The French weaponized this Vespa scooter to serve with their paratroops. It was equipped with an anti-tank recoilless gun for dealing with pesky enemy tanks.
Bouncing bombs were a peculiar type of bomb developed by British inventor Barnes Wallis during World War 2. The bombs worked using the same principle as skipping stones through a pond, albeit in a weaponized form. They were successfully used in dam busting raids deep into Nazi Germany.
Such were the effectiveness of the bombs that the Germans were prompted to develop their own versions.
Bouncing bomb diagram
The secret to the success of Barnes Wallis' bouncing bombs lie in their spin-stabilisation method of deployment. The spin induced onto the bombs allowed them to maintain their trajectory and travel in a relatively straight line towards the target. The bombs required nerves of steel to deploy as they could potentialy damage the aircraft upon bouncing through the water.