'Who in their right mind gets baptised? Why would anyone take a bath in public? Let's be honest. When an otherwise perfectly normal human being announces to the world that they are going to be dunked fully under water in a public ceremony - questions about their sanity need to be asked!' Maybe that's a question you're asking yourself? It's surely the question that some of the onlookers must have been asking, with raised eyebrows, at the impromptu, but nevertheless very public, baptismal service of the Ethiopian Chancellor of the Exchequer in the first century.