Frigg, greatest of the goddesses and the wife of Odin, lord of the gods, possessed a magic looking glass through which she could see all that came to pass — whether in Asgard, in Midgard, in Niflhelm where the ice giants dwell, or even in Svartalfheim, home of the dark elves.
One day, while consulting with her looking glass, she happened to see Odin, disguised as a mighty fish-eagle, descend to Vanaheimr where he perched upon the shoulder of the beautiful Vanir Freyja, goddess of beauty, love, and fertility. The eagle began to speak into Freyja’s ear and the goddess began to giggle. Seeing this, Frigg was enraged because, although her looking glass could show her all that happened, she could not hear what passed between her husband and Freyja.
Resolving to discover for herself what was being said, she abruptly left her boudoir and came out into the god-bright sunshine of eternal Asgard. Seeing mischievous Loki, the prankster god, lounging idly in a nearby poplar grove she commanded him to “call me a cab.”
Shrugging his shoulders, naughty Loki replied, “Okay, you’re a cab.”