Do you know where the term "Balls to the wall" came from? No cheating, if you don't know, don't look it up!
The term Balls to the Wall comes from the running of old steam engines. They had a speed governor that consisted of two or three brass balls that spread out as the speed increased. When they were full out, to the wall, you were running the engine as fast as it could go. It was adopted by military pilots because of the balls on the throttle handles.