We'll begin with a well-known sleeve that introduces the concept of subliminal messages rather nicely ... and by way of introduction I've included the 'rationale' for my interpretations in parentheses.
But typically, if an interpretation has to be 'explained' like this then it is almost certainly wrong ... but this sleeve lends itself rather well to such an approach, so it's a darned good one to start with!
Beatles - Let It Be