It’s time to buy a pumpkin and carve a Jack O’ Lantern out of it to keep away the witches and ghosts, which was the historical “reasoning” behind hanging Jack O’ Lanterns on houses and huts. It has always worked for us.
By the way, in days of yore, a “jack-o’-lantern” and “will-of-the-wisp” were the English names for any unknown light that appeared over British peat moors. (Brooklin, Maine)