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Eminem is teasing an unheard version of his award-winning single, "Lose Yourself." The funny/best part about this version is that the rapper totally forgot about it!

In a video released by Shady Records, Em explains his shocked reaction to learning about the forgotten demo version. He said, "There was another version of that song that I don't even remember recording, 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!"

A caption attached to the teaser also says that the full story of the "Lose Yourself" demo will soon be revealed.

Fans will get to hear the previously unreleased song on the Shady Records compilation album, Shady XV. The album arrives in stores next week, but it is already available for pre-order. Apart from Eminem, the two-disc album will feature songs from 50 Cent, D12, Slaughterhouse and Yelawolf

[Buy SHADY XV on iTunes]

Check out Eminem talking about the unreleased, forgotten version of "Lose Yourself" below:

And here's the single that blew up on the radio:

Photo: YouTube