There have been several times that Morse has been used in TV programs in a way that only the cognoscenti would notice. The most famous example was the BBC TV Series about Inspector Morse - where the theme tune used Morse in Morse code as its starting theme and rhythm. Having had to learn Morse a _long_ time in the past for a license, it was quite surprising how the message got through so fast subliminally . However, things have now descended to a new level though
That's not all there was to Morse. The rhythm to the backing music would spell out 'guilty' when the murderer made their first appearance in the early programmes. I won a lot of beer from the Morse watching group I used to hang out with in the 1980s...!