Scene: Happy Halloween hat on Bunny Foo Foo, a 35 foot tall leaping stainless steel rabbit, who resides at Hall Winery in St. Helena, Napa Valley, California. Modern Halloween evolved from the ancient Celtic holiday of Samhain. The Celts used the day to mark the end of the harvest season and the beginning of winter, and also believed that this transition between the seasons was a bridge to the world of the dead.