瓢ひょう箪たんから駒こまが出でる

expression, ichidan verb

something unexpected happening; a joke becoming reality

Used when something surprising or unlikely occurs, especially when a casual remark or joke actually comes true. Literally 'a horse comes out of a gourd'.

• 冗じょう談だんで言いったら、瓢ひょう箪たんから駒こまが出でるように本ほん当とうに当あたった。

  I said it as a joke, but like a horse from a gourd, it actually came true.