Every November 1 is the western Halloween. October 31 is the Eve of All Saints' Day. It is usually called Halloween. Whenever Halloween comes, children can't wait to put on colorful costumes, wear strange masks, and carry a "Jack lantern" to go from house to house to ask adults for gifts. The most well-known symbols of Halloween are these two - the strange "Jack-o'-lantern" and the prank of "trick or treat".