In 1991, Guns N' Roses released "Get in the Ring," a profanity-laced track that personally dissed journalists who drew singer Axl Rose's ire.
Lesser known and definitely crazier, Axl fired off a scathing 1992 missive (via fax) to Indianapolis Star critic Marc Allan, who panned a GNR show after the band took the stage two hours late. Axl promised Allan that he could "suffer your redneck, blind, narrow minded refuse about ranting -- you nor anyone will ever dictate my actions, attitudes, comments, oratation, and musical performances on stage."
Calling himself Allan's "Rock N' Roll nightmare," Axl strangely signed off by saying "stay away from microwaves." You can read the full screed via Letters of Note.