What should I say when giving candy on Halloween?

Halloween is 10 and 3 1 every year. It is the eve of Halloween (1 1 October), which is usually called Halloween. This night is the most haunted night in a year, so it is also called "Ghost Festival". Originated from the ancient Celtic New Year, it is also a festival to worship the dead. While avoiding the interference of evil spirits, it is a traditional festival in the west to worship ancestors and kind gods with food in order to pray for a safe winter. During Halloween, many public places and even the courtyard at home will be decorated with many decorations, such as various ghosts, pumpkin lanterns, black cats, witches' brooms and so on. Every year, children wear different Halloween costumes and go door-to-door begging for candy with a basket of pumpkin lanterns, saying that it is "trick or treat".