Board Thread:Speculation House/@comment-30379057-20180522011632/@comment-30379057-20180905183008

Yes. The dwarves had a bet with Loki, and in that bet, Mjolnir, Gungnir, Frey's ship, Sif's new hair, and Gullinbursti were introduced. Loki was losing the bet, so he transformed into a fly and started biting Brokk while he was making Mjolnir. The bet was the dwarves having Loki's head if they impressed the Aesir. The Aesir were indeed impressed, but Loki explained that while the dwarves could have his head, they did not have the right to cut any part of his neck. Frustrated by this, Brokk immediately sewn Loki's lips shut. It isn't clear how long he had them kept sewn or when they were removed after.