Eminem gave his day-one "stans" a surprise they'll never forget.

An army of Eminem's fans gathered on The Rooftop at Pier 17 in New York City on Wednesday night, August 6, to catch the debut of the rapper's documentary, Stans . As his 2000 hit "Stan" blared through the speakers, Eminem unexpectedly appeared at the premiere to roars of cheers from excited fans.

"Let me tell you why this s**t is crazy to me," Eminem told the crowd during an emotional speech. "When I was writing this song, I didn't understand the impact that my music was having on people at the time."

WARNING: EXPLICIT LANGUAGE

"It was really surreal to me, and it's still surreal to this day, to look out here and see all you and the fact that my music has inspired you," he continued. "This film is a 'thank you' to

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