Saying “Moshi Moshi” Proves You Aren’t a Ghost
There is an idea that the reason “Moshi” is said twice in the Japanese phrase “Moshi Moshi” is that ghosts can’t say “Moshi” twice. Thus, saying “Moshi Moshi” proves you aren’t a ghost. This is unlikely to be the true root of “Moshi Moshi.” It is more likely “Moshi Moshi” is simply an evolution of the telephone hello used by telephone operators.