Many children dress up in fancy costumes and visit other homes in the neighborhood. At each house, they demand sweets, snacks or a small gift. If they do not get this, they threaten to do some harm to the inhabitants of the house. This is known as playing 'trick-or-treat' and is supposed to happen in a friendly spirit, with no nasty or mean tricks being carried out. However, if your children take part, it is important to accompany them and to check their 'treats' to make sure they are safe to eat or play with.