that's one for the (record) book(s)

that's one for the (record) book(s)

That is a remarkable, unusual, or unexpected event, occurrence, or piece of news. Mr. Literature Snob reading a trashy romance novel? Now that's one for the books! A: "After the concert, I ran into the singer at a pub down the road from the venue. It turns out, his mother went to the same school as mine!" B: "Wow, that's one for the record book!"
See also: one
Farlex Dictionary of Idioms.
See also:
  • one for the (record) book(s)
  • one for the book
  • there's one for (record) the book(s)
  • a turn-up for the book
  • a turn-up for the book(s)
  • a turn-up for the books
  • that's a turn-up for the book(s)
  • there's a turn-up for the book(s)
  • lucky for you
  • stroke of fortune