Carving Pumpkins dates back to the eighteenth century and to an Irish blacksmith named Jack who colluded with the Devil and was denied entry to Heaven. He was condemned to wander the earth but asked the Devil for some light. He was given a burning coal ember which he placed inside a turnip that he had gouged out.
Thus, the tradition of Jack O'Lanterns was born - the bearer being the wandering blacksmith - a damned soul. Villagers in Ireland hoped that the lantern in their window would keep the wanderer away. When the Irish emigrated in their millions to America there was not a great supply of turnips so pumpkins were used instead.