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

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

A remarkable, unusual, and 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