How did Sunday become the "Sabbath Day?" Why did St. Valentine become the patron saint of lovebirds? Most people happily participate in Mardi Gras, Halloween, St. Patrick's Day and Valentine's Day with very little knowledge of the origins and meanings of those days. Here, in these witty and accessible chapters, Greg Tobin explains the often unknown and untold origins of the holidays and annual celebrations - inside and outside church - that bind our society and give color and spiritual content to our lives.