What is Halloween without jack-o’-lantern? The idea of this scary pumpkin came from the Celtic festival of Samhain, which was celebrated on November 1 and inspired many traditions of Halloween that we know today. People believed that in that night spirits of dead people walk among the living. To ward off them, people began to do scary faces into root vegetables - pumpkins. Now you know more about the most famous symbol of Halloween. Neon cursor with Jack-O'-Lantern.