Climax

This story had a few ups and downs, but I'm pretty sure that the climax was when Loki turned into a mare and lured the stone-mason's horse away into the forest. This caused the stone-mason to get all mad and turn into a Jotun and such. What happened was that the Jotun's horse, Svadilfari, was helping the Jotun to complete the wall around Asgard by helping pull along the stones used to build the wall. When the wall was almost finished, the gods knew they would have to pay the stone-mason his reward - Freyja, the sun, and the moon - for completing it, even though they did not want to. So then Loki got to be the hero by turning into a mare and leading Svadilfari off into the forest, preventing the stone-mason from finishing his work on the wall. He got all mad and turned into a Jotun, so Thor showed up and smashed his head with his hammer. Thor always seems to show up to save the day.