As children, my cousins and I would play “They’re Coming To Take Me Away” on their little record player… backwards. We could actually, physically force the turntable to go in the opposite direction, and I’m here to tell you that that song – backwards – was a major hoot. No hidden messages. No misinterpreted meanings. Just goofy 9 year old fun.
Re hidden tracks, I still have my 'Matching Tie & Handkerchief" Monty Python LP; one side has two interlaced tracks which I discovered by accident. Imagine my initial confusion!