From a Wall Street Journal story by James Reginato headlined “The House That ‘Rolling Stone’ Built”:

Among the many treasured possessions that Jann Wenner has collected during his rollicking career is a framed cover of the magazine he co-founded, Rolling Stone, autographed by its subject, Sean Penn: “To Jann, from one asshole to another.”

“Sean used the term in an endearing way,” says Wenner about the artifact, which leans against a wall at his home in Montauk, New York.