Yesterday, as we struggled through a field of oil-seed rape on a narrow footpath, an odd high-pitched unpleasant noise started. It was like the alarm of a car or house though there were none to be seen. Even more oddly, the noise moved with us. Its origin was a puzzle until someone realised that it came from one of us. The culprit was identified. Was it her phone? No, it was the gadget attached to her waistband: her pedometer. Poking it had no effect. The only way to silence it was to remove its battery. This required a screwdriver. Fortunately, the back marker had a Swiss Army knife with him. Peace was restored.