used to express satisfaction that something bad has happened to someone who deserved it, or to show that you have succeeded in something

He left her? Ha! That'll teach her to go chasing other women's husbands! 他把她甩了，是吗？哈！那是她勾引有妇之夫应得的教训。

Ha! So I am right after all! 哈哈！结果还是我对了！