Gene Kelly
Gene Kelly filmed the most famous dance scene in movie history with a 103-degree fever, in a wool suit shrinking from the cold water, directing and choreographing himself simultaneously. The story that the rain was mixed with milk is a myth — it read on camera thanks to backlighting — and it wasn't one take, but multiple takes over a day and a half with cold water dropped from above between setups. The American Film Institute ranks Singin' in the Rain the fifth greatest American film ever made; this is the scene everyone remembers.