Flying saucer lifts off from field without a sound or trace.

On a fall evening, just before Halloween, in 1975 my cousin and I ages 11 and 12 years old went for a walk in my neighborhood.  There was a field that sat between the cul-de-sac at the end of my street and Route 17M.
From the field suddenly lifted off a flying saucer with red and white lights about as bright as car taillights.  It shot up approximately 50ft. and hovered just above the treetops for a few seconds before accelerating at lightening speed on a northerly angle.
There was no sound or smell or fumes or trail whatsoever.  We would have never known that the saucer was in the field had in not lifted off the ground.
We were stunned (no, not by a ray gun) and speechless.  However, we continued on our merry way and never told anyone about the sighting.  We never even discussed it again until adulthood!
Witness indicates that the date of the sighting is approximate.  PD