Malcolm Brabant, a BBC reporter, was believed to have a psychotic episode after getting a yellow fever vaccine. It's reported that he had a fever of 40C after the injection followed by delusions of being Jesus. Eventually, he's forced to go off air to recover. No one in his family history had any mental illness.
I thought the beginning of the article was interesting - describing the reporteras "award-winning" and juxtaposing that with the yellow fever psychosis. This puts vaccines in a bad light and may prompt other people to reject vaccination. Although the article mentions that no causal relationship was drawn between the vaccine and his psychosis, the title and the majority of the paper implies this.