The Silver Age is kooky on any given day, but sometimes, it outdoes itself. Like when the chunk of kryptonite that would eventually end up in Lex Luthor's lab that fateful hair-loss, revenge-gain day turned out to be sentient enough to tell its own story. What the what?!
Well, it was originally the head of a bust awarded Jor-El for discovering the Phantom Zone, so OF COURSE it has a brain... Once converted into Green K by the planet's destruction, it crashes to Earth and has many adventures, coming into contact with Super-Monkey in Africa before making its way to Smallville and through a sequence of insane coincidences, into the Kents' lives where it affects Clark adversely not once, but three times! That third time, it lies abandoned next to the Langs' pool into which Clark is thrown by a crook. Clarkie was faking it at first, but he soon became weak for realz. Time for the Superboy Signal!