Accidental Bloodline

After Naruto learns a Katon Jutsu from Ebisu, the Kyuubi finds that Naruto's element is Wind. The Kyuubi being offended by the fact that his Jinchuuriki had a different element than him tries to overwrite the Wind affinity with Fire, but he makes a slip up. Now Naruto has his Wind and the fire affinities mixed giving him Ash Release(Haiton).