I thought you might like this one, esp. being from my homeland!
The Jack O Lantern Legend
It's unlikely that pumpkins grew in Celtic heartlands, so our ancestors probably made pumpkins by hollowing out turnips and placing a candle inside. There is an enduring Irish story based on the Jack O Lantern. Mischievously, Jack tricks the Devil into climbing up an apple tree, with a promise of cider. Then, Jack carved the sign of the cross, into the trunk of the tree. This infuriated the devil, as he dared not climb back down the tree and touch the cross.
Years later Jack dies and because of his life of mischief, drunkenness and worse, there is no chance of him going to heaven. Reluctantly, Jack heads for Hell, but the Devil remembers his prank of the cross on the apple tree and consequently refuses Jack entry into Hell. Thus, Jack is left to roam the Netherworld, and the only time of the year when he can become visible, is at Halloween, hence Jack O' Lantern!