have u ever forgotten the bank note you had put in your books or somewhere else?

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i used to putting some bank notes in my books to be a bookmark.but sometimes i forget to get them out when i already have finished reading.but i also like to reviewing the books that i have read before.so when i am reviewing,i can often find some bank notes by accident.then i will be really surprised and happy,things like,i have won a lottery,and these money seems to be my extra gain.and so i really enjoy.have you had the same experience?