突とつ然ぜんだけど

expression

apropos of nothing; to change the subject

Used as a conversational opener when suddenly changing the topic or bringing up something unrelated. Often softens the abruptness of the new subject.

• 突とつ然ぜんだけど、明日あした引ひっ越こすことになったんだ。

  This is out of the blue, but I'm moving tomorrow.

• 突とつ然ぜんだけど、君きみに聞ききたいことがある。

  Sorry to change the subject, but there's something I want to ask you.