Maybe I need a straight jacket, face facts
I am nuts for real, but I'm okay with that

from Eminem (Ft. Rihanna) – The Monster Lyrics on Rap Genius

Meaning

Typically, clinically insane people are put into a straight jacket to prevent them from harming themselves or others and Eminem freely admits that, yes, he’s insane, but that’s just who he is and he’s fine with that.

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