I once knew a pilot who "Flew for over 25 years without sighting anything remotely approximating a UFO!"

However, he added: "At least not until one of my last few flights when we were 'buzzed' by a small silver disc which demonstarted preposterous manouevarability. Even though I was very close to retirement I dared not make an official report for fear of my sanity being questioned."

Of course, such anecdotes remain merely that -- anecdotal! So let's just forget that anything like this could ever happen...