The narrator claims that he is not mad, yet reveals that he is a murderer.

VOA: special.2009.02.02

Yeats spoke of the poem as a mad song, maybe not a kind of mad song we would--it's not what we would think of as a mad song, necessarily.

叶芝说这是首狂诗歌，也许不是我们所讲的狂诗歌,不一定是我们所认为的狂诗歌。

耶鲁公开课 - 现代诗歌课程节选

Let's hope that all the changes I mad have not introduced a syntax error.

希望我要做的所有这些变化,不会有什么句法错误。

麻省理工公开课 - 计算机科学及编程导论课程节选