Who's Afraid of Virginia Woolf?"" ""Stop the World I Want to Get off!"" . . . these are just two classics from the omnipresent handwriting on the wall. . . graffiti entreaty and to be graphic about it, Mr. Mockridge will include some fifty cartoon illustrations as he traces the art (?) through the centuries: ""Romulus and Remus are Wolves."" He also tells you what to look for when visiting such redoubtables as the Statue of Liberty (one of the great anonymous crawled six feet out on a ledge five stories up to leave his legend) or the Yale Library: ""Reagan only wants to use the White House as a stepping stone."" Then there are the psychological soothsayers . . . one little scrawl, ten inches off the floor: ""Will I ever grow up?"" And the advice givers: ""Support Your Local Police Station. . . Steal!"" Fun for the Great Anonymous and whoever doodled ""The Kirkus Service is owned and operated by the C.I.A.