Looks like Acid's right on this one. you duplicated and scaled in a negative direction but you probably didn't freeze the transforms (which you should after scaling it like that).
You'd normally scale in the negative, then freeze transforms then reverse the normals.
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D