Although Lex did not exactly know the entire story behind Clark's alien origins, he knew there was something odd about his friend from the moment that Clark saved him by pulling him from Elbow River following a car accident. Lex was sure his car had hit Clark, and was immediately doubtful of Clark's claim that he dove after him. Lex gave Clark the opportunity to share his secret on his own terms as their friendship grew, but often could not resist asking Clark prying questions. Clark used a temporary loss of his powers to "prove" his vulnerability. Nevertheless, Lex's curiosity was not that easily satisfied.