It's a fear of naturists who use dusk and beyond to emerge from the berry-clad bushes and expose themselves to the night. Unclothed they have the power to hover over fences and walls and look to take up residence in sights of natural beauty, such as the Amex. A reliable source told me when the camera was first erected that they caught sight of at least 32 saggy old chaps floating around the stadium usually a few inches from the turf so as not to leave toeprints.