No hiding place

Have you seen the almost unbelievable story of how you can be eavesdropped upon using just about anything which happens to be close to you?  It goes like this - any sound causes anything nearby to vibrate, albeit microscopically in most cases.  But a sensitive enough video camera running at high speed can capture these vibrations, which can then be converted back to the sound which created them.  So there's no need to bug you by planting hidden microphones - all you need is line of sight and a good enough camera.  So be careful out there!