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The Lay of Thrym. All of it. Mjölnir is stolen by the frost giant Thrym, who demands Freyja's hand in marriage as a ransom. Naturally, the gods turn to resident Trickster Loki for an answer. His solution? Get Thorto pose as Freyja. So, Thor and Loki travel to Jotunheim for the wedding, and it falls to Loki to explain the blushing bride's odd behaviour. 'Freyja' devours a whole ox? She's been so excited about her wedding, she hasn't eaten in a week. Her eyes are filled with fire? It's fine - she hasn't slept in a week either. Thrym demands his men to bring Mjölnir in to bless the bride, but this is too much for Thor and he seizes his hammer... and kills everyone in the room, but by the moral standards of the Aesir it's OK to do that if they're giants. Nowhere in the Poetic Edda does it mention Thor shedding his disguise, so one must picture a huge, hairy man beating people up in a dress. You've got to wonder how Loki explained the beard...
Even better: in at least one version, it was Heimdall's idea to put Thor in drag, and Loki happily volunteered to be the bridesmaid.
There's that thing about Thor kicking a dwarf into his brother's pyre.
Balder's death-by-mistletoe can be seen as hilarious, depending on context.
The gods making a game out of throwing things at Balder and watching them bounce off is funny as hell, too.
It becomes signifiantly less stupid when one realises that Gesta Danorum pretty much suggests that it was a sword that killed himnote Then again, said sword was literally named "Mistletoe", so.... However, Gesta Danorum Balder is hilarious because he's basically the Norse god version of Gaston.
The tale of how Loki had to make Skadi laugh to compensate for the death of her father Thiazzi. Let's just say it's NSFW, and involves rope and a goat.
Then Skadi chooses her husband by picking from the assembled gods' feet. She wants Balder, and figures that the nicest-looking pair has to be his. They turn out to be Njord's.
The gods made a wager with an unnamed builder to build them a fortress in a specified period of time, in return for a great treasure, and the hand of Freyja, by some accounts. To get out of paying the treasure, they turn to Loki, who transformed himself into a mare, to lure away the builder's draft-horse. Long story short, Loki found himself pregnant by the draft horse, and later gave birth to Sleipnir, the eight-legged steed that Odin rode across the sky
Freyr's predicament. He gave away his sword to bang a giantess... and that left him weaponless. What does he do? Beat up people with a reindeer antler.