Maybe you're mis-remembering it a bit. I found on Side 2-B, 3rd cut of "Consequences" a man brushing his teeth (probably binaural recording at that point), leaving the room, then a drop of water starts slowly and gets faster, it's obviously filling up a container (the lavatory?) and then it becomes a wave, rhythmically, and then it becomes a beat in a rock band at a concert with an audience cheering. This is one weird 3 album set. Peter Cooke does an enormous amount of monolog/dialog and even Sarah Vaughn gets into the act at one point. The copyright is dated 1977.