A jack-o’-lantern is a carved pumpkin. It is associated chiefly with the holiday of Halloween, and was named after the phenomenon of strange light flickering over peat bogs, called ignis fatuus or jack-o’-lantern. Thanks, Wikipedia. The difficult part, after carving them, that is, is getting the exposure right in the inevitable photographs. Too little and only the cutout face appears. Too much room light and the internal illumination is lost. The trick is to get close and check the results on the camera’s LCD display.