Joke's on you - graffiti artist shares some laughs in JHB

Advertising billboards across Johannesburg have been hit by an unknown graffiti vandal. Billboards in Fourways, Bryanston, Midrand, Rosebank, Hyde Park and at the Sandton Police Station have all been vandalised with the words 'ha ha ha' in red capital letters.

It's unclear who the vandal is, but it'll be interesting to see who this Joker is. *Update*: Well, it turns out the graffiti vandal was in fact Ster-Kinekor. It forms part of the cinema chain's campaign for the Joker film.

The brand launched a guerrilla style "Joker take-over" marketing campaign, asking people who could be behind the "Ha Ha Has" emblazoned across the streets of Johannesburg for a chance to watch the film.