よりによって

expression

of all things; of all people; of all places

Used to express frustration or lament that something particularly undesirable was chosen or happened. Often followed by a negative outcome.

• よりによって今日きょう、雨あめが降ふるなんて。

  Of all days, it had to rain today.

• よりによって彼かれが遅ち刻こくするとは思おもわなかった。

  Of all people, I didn't expect him to be late.