What’s the most personal thing you’ve ever found inside a second-hand book?

I’ve always felt second-hand books carry more than stories.

Sometimes it’s a forgotten bookmark.

Sometimes a handwritten note.

Sometimes someone’s name on the first page.

Sometimes even an old receipt… frozen in time.

And honestly… that makes the book feel even more alive.

So I’m curious—

What’s the most personal, surprising, or emotional thing you’ve ever found inside a used book?

Could be:

A note

A letter

A highlighted passage

A photograph

A date

Someone’s signature

Would love to hear your stories.