The Old Woman and the Giant Octopus / Dokkoisho / The Tengu of Ashitaka Mountain

An old woman cuts off the leg of an octopus on the beach, and gets rich by selling it at the market. A groom is given botamochi rice balls at his bride's village. He wants his mom to make them, so he keeps saying "botamochi" on the way home, but then he trips and rises up saying, "dokkoisho! A strong-willed and hardworking mother goes all alone to Ashitaka Mountain, where a Tengu lives. But she doesn't come back. Source: crunchyroll