In February of 2014, a guy named Jason Dang uploaded this photo and said he found the note in a book on a shelf of a cafe.

Congrats! You have found THE note! I will give you $300 if you come back here on May 27, 2015.

The mystery note writer also left a code word, which Dang covered up.

The note got a lot of attention, and over 1,000 users commented on it. Many users told him it was clear: he had no choice but to go back the next May.

Dang wrote that he put a counter-offer in the book, but never heard back. "I came back in July, (his note) was still in there," he said. "So I took it out and assumed the original date still stood...if they remembered anyways."

Dang wrote that he put a counter-offer in the book, but never heard back. "I came back in July, (his note) was still in there," he said. "So I took it out and assumed the original date still stood...if they remembered anyways."