I Swear is a 2025 British biographical comedy-drama film directed, written, and produced by Kirk Jones. It is based on the true story of John Davidson, who was diagnosed with Tourette's syndrome, and also features the process of the securing and filming of the BBCs 1989 television documentary John's Not Mad, at a time when his condition was barely identifiable. The film stars Robert Aramayo, Maxine Peake, Shirley Henderson, and Peter Mullan.