speak of the devil

Translations
лёгок на помине
He was just talking about John when Mary walked in. Speak of the devil!
Он только что говорил о Джоне, когда вошла Мэри. Лёгок на помине!
Definitions
A phrase used when a person mentioned in conversation unexpectedly appears, often implying that their arrival is coincidental or humorous.
Words
speak

verb
говорить
of

preposition
о
the

article or possessive pronoun
этот
devil

noun
дьявол