Artie Lange

From OAPedia.com

Artie Lange is a comedian/suicidal mess who works on Howard Stern's radio show. He's had a tenuous friendship with Opie and Anthony over the years. At times, O&A acknowledged how funny Artie is; at other times they've gone at it with each other. One time on Howard's show, Artie trashed O&A's appearance on Letterman. Another time, Artie and Opie had a heated argument in the Sirius XM building[1], though Opie said they later talked things through and made up.