Religious Holidays - Purim - Jewish

From http://www.jewfaq.org/holiday9.htm

We are also commanded to eat, drink and be merry. According to the Talmud, a person is required to drink until he cannot tell the difference between "cursed be Haman" and "blessed be Mordecai," though opinions differ as to exactly how drunk that is. A person certainly should not become so drunk that he might violate other commandments or get seriously ill. In addition, recovering alcoholics or others who might suffer serious harm from alcohol are exempt from this obligation.

Obligation! My personal religious beliefs aside, this sounds like a fantastic holiday! :)