Vanishing Trick

Have you ever had a friend just disappear off the face of the world.  Email, phone, everything suddenly appear to be switched off or disconnected.  It is disconcerting to say the least.  Especially when it's a good friend.  You are left wondering if there is a major earth shattering disaster in their life, or whether it is simply that you have done/said something wrong without realising it.  It's a horrible feeling, it's as though some filaments holding you to the world have been severed and are waving loosely in the breeze.  Not recommended.