 In the episode "Mayonnaise", at the end of the show Space Ghost starts  singing an Irish song and the song continues to play during the credits.  At one point he sings, "Meet.. Brannigan, Fannigan, Milligan, Gilligan,  Duffey, MacCuffey, Mallochy, Malone, Rafferty, Lafferty, Donnelly,  Connelly, Dooley, OHooley, Muldoony, Mahone, Hadigan, Cadigan, Lannihan,  Flannihan, Fagen, OHagen, OHoulihan, Flynn, Shannahan, Mannahan, Fogarty,  Hogarty, Kelly, OKelly, MacGuiness, Magin".  As these names are being  sung they appear in the "Special Thanks" credits.