Lex Luthor robs a local bank and throws Clark through a window, helping him develop his X-Ray powers.  When Clark's X-Ray powers show a green glow around Lex's skeleton, it turns out someone is impersonating him and Clark eventually discovers it's a shape shifting Tina Greer (Lizzy Caplan).  Clark ends up battling her and knocking her unconscious for the authorities.

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Smallville Season 1 Episode 4 Quotes

Jonathan: Yeah, you could start with something small. (reaches into pocket) Try to tell me what I have in my hand right now.
Clark: Your pocket knife.
Jonathan: You could see through my hand.
Clark: No, you always carry your knife in that pocket.

Can I come in? I promise I'm not packing heat.