Skiippppeerrrrrrrr! Prrofffessssoorrrrrrr! Anybody?!
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A key piece of concept artwork from Rob MacGregor's lost Indy IV script, Indiana Jones and the Yo-Yo of the Giants.
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"Ah, Dr. Jones, welcome, come in. You have found my secret Mayan Temple base. As you can see, this rope is tied to the tree, but Dr. Schneider's lighter is positioned right below the knot, slowly burning it away. Of course, there is very little lighter fluid in it right now, but I will take my chances and begin to ramble on about my secret Communist schemes..."