A rabbit crapped on Arc's head! It obviously died, but it turns out that it was holding a Jutsu scroll! (1 free Jutsu A rank or below)
A sheep rubbed it's REALLY dirty wool on you! Your clothes are ruined, but the filth was radioactive so you now get 2 b rank earth ninjutsu!
A dragon kidnapped you for a year! After escaping, you learned Earth Dragon Bullet!
A cock rubbed it's....cock on your face. IDK how but you somehow learned 2 b rank wind Jutsu (and the element)...it's a blowing joke