Halloween is a celebration on the night of October 31st. It is most practised in the United States and Canada. Children wear costumes and go to people's homes saying "Trick or treat!" to ask for candy (sweets in the UK) and people give it to them. The suggestion is: "Give me a treat or I will play a trick on you." People mainly dress up as ghosts, witches, or other scary things for Halloween. It is often referred to as ‘the scariest time of the year’.