Loki and Thor Picture
The giant Thrym stole Thor's hammer and wouldn't give it back. Thrym said, "I'll give back your hammer when you send me your wife, Freya, to be MY wife." Well, Thor was okay with that, but Freya wouldn't go. In fact, her anger "shook the hall". So instead Thor dressed up as Freya, and Loki dressed up as Freya's servant, and they traveled together to the land of the giants.