« I thought Oz was a great head, » said Dorothy.
« And I thought Oz was a lovely lady, » said the Scarecrow.
« And I thought Oz was a terrible beast, » said the Tin Woodman.
« And I thought Oz was a ball of fire, » exclaimed the Lion.
« No, you are all wrong, » said the little man meekly. « I have been making believe. »
« Making believe! » cried Dorothy. « Are you not a Great Wizard? »
« Hush, my dear, » he said. « Don’t speak so loud, or you will be overheard - and I should be ruined. I’m supposed to be a Great Wizard. »
« And aren’t you? » she asked.
« Not a bit of it, my dear ; I’m just a common man. »

From The wonderfull wizard of Oz (L. Frank Baum).
And this is where it all began…