this is known as E.V.P. or electronic voice phenomena. it is reputed to
be the voices of dead people, or spirits, or devils, depending on who
tells the story. personally i believe that it is a combination of
imagination and the millions of spoken words hanging in the air on radio
at any given moment. there is a variation if you want to get really
freaked out, set a tv on a blank station with no signal. listen to the
hiss and you will hear the same kind of words and bits........but sit
close and watch the sparkles on the screen and you will see faces and
images zoom out of the static! its quite disturbing! i think that the
explanation is this, your brain is constantly comparing every visual
stimuli with its gallery of known objects. this is how you recognise
peoples faces or different objects. the sparkles on the screen have
every pixel flashing and your brain is trying to make recognizable
patterns. when a pattern is detected the memory of the object rises up
to be considered. by this time the random sparkles have changed, thus
the object or face rises to your mind then evaporates as another pattern
is struggling to be resolved. in your minds eye the face has zoomed up
out of the static and then zoomed away. the audio seems to be the same
thing, words resolve out of the hiss and then are lost forever. the best
part is psychological, you seem to recognise the word or picture but
since it has gone away now you cant prove that it was never there to
begin with! soon you are on the art bell show with a great story that
you really do believe and nobody can disprove! great fun!