
Take a look over in alt.folklore.urban.  There is a thread about subliminal
messages on TV.  The fact that subliminal messages don't work aside, an image
can't be flashed on a TV screen fast enough to not be noticed.
-- 
  Bob Billson, KC2WZ                          | internet: bob@kc2wz.bubble.org
  $nail:  21 Bates Way,  Westfield, NJ 07090  | uucp:     ...!uunet!kc2wz!bob