Armed with a sharp knife, a megaphone and dressed all in black, Gbenga Adewoyin could have passed for a medieval witch hunter, a herbal salesman or an urban preacher as he walked around a market in the south-western Nigerian city of Ibadan.
Those curious enough to get close in the Gbagi market quickly dispersed when they heard his message. “Anyone that can provide any evidence for the existence of the supernatural, be it juju or voodoo magic, will be offered 2.5m naira ($6,000, £4,650),” he announced repeatedly in Yoruba and English.
