I know of an accident when a pilot landed a tailwheel aircraft downwind in accordance with the signals T, which was never ever kmoved.
When I was getting my PPL at Thruxton in 1964, Mrs X came to meet her husband, who was still flying. As she chatted, 7 year old Miss X put her younger siblings on the roundabout, and pushed it round. Little wind, no ATC, no radio, and the grass was used without marked runways. And the 8 Jackeroos did not have brakes.
NO accidents. But I do not share Jan''s enthusiasm for TS on a signal square.