The Invisible Pink Unicorn is a fictional female deity in the form of a unicorn. Her Holy-Hoofness is a goddess invented at the usenet discussion group alt.atheism as an alternative to other parody deities like Church of the SubGenius, Eris of the Discordianism, and the Flying Spaghetti Monster.
Her Holy IPU-ness is available as a car emblem, a pendant and as a pin at Ring of Fire's web site.
The following two sightings are from southern California: