In Norse mythology, when Loki had Sif's hair, Freyr's ship Skidbladnir and Odin's spear Gungni done by the sons of Ivaldi, he bet his own head with Brokk that his brother Eitri wouldn't have been able to make items worth as much as the ones above.
So to make gifts to Freyr, Eitri threw a pig's skin into furnace as Brokk worked on the bellows and together they manufactured two non-living machine boars, one of which is Gullinbursti (meaning "Golden Mane")which had bristles in its mane that glowed in the dark. The other lesser known compatriot boar's name is Slidhrugtanni.