'Lose Yourself' is one of the most important songs of the century, but it turns out Eminem wrote another version of the song and he totally forgot about it.
In a video accompanying the release of his new album 'Shady XV', Eminem said: "I don't remember where I was at when I recorded it. I don't remember any of the first verse. I don't remember."
Although the beat is the same, Eminem's lyrics on the alternative demo version are very different.