Eminem is well known for his crazy dedicated work ethic, a detail D-12's Bizarre reminded everybody about in a recent interview.

“It was a lot of work, man. I think we had fun after the studio,” he said in an interview with Bootleg Kev. “Being in the studio with Em, man, sometimes you might be in the booth for five, six hours doing one verse over. He was on yo ass."

Bizarre released two official albums with D-12, 2001’s Devil’s Night and 2004’s D12 World. He said that Em was no joke in the studio, in spite of the comical nature of many of the group's songs, which featured vivid, animated storytelling.

“I remember one time he got so sick with it, man, I went home and he wanted me to do some ad-libs over," Bizarre remembered. "I guess he couldn’t wait ’til I came back; the next day, he had did them for me. He sounded just like me, my voice. I was like, ‘Bro, you are sick.'”

Check out the interview above.