http://ru.wikipedia.org/wiki/%D0%9A%D1%83%D0%BC%D1%83%D0%BB%D1%8F%D1%82%D0%B8%D0%B2%D0%BD%D1%8B%D0%B9_%D1%8D%D1%84%D1%84%D0%B5%D0%BA%D1%82

Munroe effect