Joukahainen is a character from Finnish mythology, particularly known from the epic poem Kalevala. He is depicted as a young and boastful man who challenges the wise old bard Väinämöinen to a contest of knowledge and skill. In the story, Joukahainen's arrogance leads to his downfall when he loses the contest. To save himself, he offers his sister, Aino, to Väinämöinen as a bride. This tale highlights themes of pride, wisdom, and the consequences of one's actions in Finnish folklore.