I had always heard that it derived in early 20th cent./late 19th cent. theater. It was wished to a person about to go on stage as a means of disarming the worst possible occurrence while on stage...breaking your leg. If you wish someone great success and it doesn't happen then you're in trouble but if you wish someone to break their leg and it doesn't happen then you're okay. Kind of early reverse psychology.

Nobody stranger


Nobody stranger