Adventure Comics #188

From 1953, this DC ten-cent gem features a cover by Win Mortimer that drops Superboy right into the middle of a bullfighting arena — the Boy of Steel leaps acrobatically over a charging bull while a confident matador named Jose Kentador boasts to the crowd about being the world's greatest. The cover teases "The Bullfighter from Smallville," hinting that Pa Kent himself is somehow involved in the arena action, much to the wide-eyed astonishment of the onlookers framing the scene. It's a wonderfully offbeat premise that captures everything charming about early '50s Superboy storytelling.