Uncle Pecos first appeared in the Tom and Jerry cartoon Pecos Pest in 1955, as Jerry's visiting uncle, a laid-back mouse musician who plays guitar and sings in a warm country style. The character became a fondly remembered one-off from the classic Hanna-Barbera era, resurfacing in compilations, reruns and online clips long after the original short. Fans still share the moment because it is softer and funnier than the usual Tom and Jerry chase, making Pecos an easy shorthand for a charming, slightly chaotic relative.