Producers of The Simpsons would later call Johnny Cash's appearance as the mystical coyote one of the greatest coups they ever pulled off. The episode -- 'The Mysterious Voyage of Homer' -- first aired in 1997. In it, Homer eats multiple insanity peppers at a chili festival and embarks on a wild hallucination in the desert. Cash's coyote comes down from the sky and instructs Homer to "Find your soul mate." This leads to Homer questioning his marriage before he causes a ship to wreck on the shores of Springfield. Of course, by the end, his marriage is saved and everything returns to normal.

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