Passover is a time where all families, and friends come together to remember what happened in Egypt over 3300 years ago! On Pesach one who eats Chametz-Any food that rises, when left in outside. The Bnei Ashkenaz, don't eat any grains, or anything of that manner. Bnei Chabad, and Kabbalists don't eat wet Matzah, even after it was cooked. The punishment for eating Chametz on Pesach is Karet. One must have a Cazyit(A default piece of Matzah), on the first night of Pesach, and the last.