Paid PostPosted on Jul 9, 201212 True Stories About Guest Stars On 'The Simpsons'Mel Gibson peeing behind a dumpster, Sonic Youth refusing to work with Courtney, and 10 more true stories about "Simpsons" guest stars.by UPROXXPublishing PartnerLinkFacebookPinterestTwitterMail 12 True Stories About Guest Stars On 'The Simpsons' uproxx.com