 He is unable to handle being told of his alien origins and runs away from home.Although he is attracted to Lana Lang (Kristin Kreuk), he cannot get close to her without falling over in pain because she wears a necklace made of meteor rock (kryptonite), which is a radioactive fragment of Clark's destroyed homeworld.This was a concept Gough and Millar devised to establish a reason for Clark's clumsiness.