Pete Townsend had a habit of leaning back on his Marshall stack while playing guitar. A guy I knew had found Townsends favourite stage shirt, forgotten in the dressing rooms at The Cavern and returned it to him a week or so later. Pete was so happy he asked the guy to go on the road with him. One of his jobs was to stand behind Townsends stack and "Push back" while Pete was leaning on it. One time, Townsend stood up straight and walked off to the front of the stage quickly and the amplifier stack was pushed over onto the stage in front of the audience..

Sorry, your metion of that song brings back memories.