The Black Museum is a radio crime-drama program produced by Harry Alan Towers, which was broadcast in the USA on the Mutual network in 1952. It was then broadcast in Europe in 1953 on Radio Luxembourg, a commercial radio station, and was not broadcast by the BBC until 1991.
A man on a cross-country drive repeatedly notices the same hitchhiker standing along side of the road. The driver becomes increassingly disturbed and begins to doubt his own sanity. The end is chilling.