In honor of Throwback Thursday, Tim Westwood has liberated a never-before-heard freestyle from Eminem. During his trip to London to promote The Slim Shady LP in 1999, a fresh-faced Marshall Mathers stopped by the studio with the late Proof, and busted some “ill flows” about ODing on mushrooms, his daughter, and, umm, his balls. Proof kept his rhymes a little cleaner, but just as stinging.

In November, Westwood dropped an unreleased freestyle from Jay Z, also from 1999.

Watch Em and Proof show out with their #TBT flow.