A grandmother who vandalised street signs with the letters WTF has called on a suburban Adelaide council to apologise for the signage, which she says is ugly and dangerous. Mary Jean Kolusniewski, 74, was charged after she painted signs on Weller Street at Goodwood, in the city s inner south, in July and August last year. She pleaded guilty to five counts of property damage, admitting she defaced 28 signs in the City of Unley. Mary Kolusniewski pleaded guilty to five counts of property damage. Picture: NCA NewsWire/Dean Martin Speaking to reporters outside the Adelaide Magistrates Court on Wednesday, she said the council was ruining a lovely old heritage street and would not rule out further graffiti.