Destro's Subliminal Message
In the G.I.Joe episode Sins of Our Fathers, Cobra Commander evokes a monster that dwelled in the ruins beneath Destro's ancestral home. Destro and G.I.Joe team-up and Destro uses an ancient chant to lure the monster away. Destro is voiced by actor Arthur Burghardt, Dialtone is voiced by Hank Garrett.
One of the scares of the 1980s was the "subliminal message" scare - where individuals were convinced that there were occult messages hidden in rock music, commercials, etc. Even cartoons. This subliminal message can be found when listening to Destro's chant backwards.