My ignorant music teacher, Jim Fiore's likewise weird teachers and Martin R's analysis of secret messages in rock music reminded me of the anti-drugs lecture we got in 9th grade. It was delivered by a very angry policeman, and as this was in the early 1980s in Sweden, an important part of the message was rock music = drugs. Apparently the message to take home was that we should a) not do drugs, b) not listen to rock music, and not necessarily in that order. Let us say that this compromised the credibility of the message from the start.
In order to underscore the perfidity of rock stars, the policeman explained the secret drug messages in a number of popular songs, from “Yellow Submarine” onwards. That made even less sense to me: if there were secret messages that encouraged drug use, didn't explaining them undermine the idea of having us not do drugs?
And the final blow to credibility came when he finished by apologising for his excitability, explaining that he due to illness was on prescription painkillers at the time. Well then!