I have seen with my own eyes what happens when you play this record on a sound system ... the ground trembles and gravity loses its usual persuasion (Mainline, Tottenham Hale massive NYE squat party in the late 1990s). As the run-out info states, certain frequencies can indeed "incommoder". I nearly fell over myself. Well done Les Boucles Etranges for pulling this one out of their magician's hats.