In 1926 a Budapest coffee house waiter committed suicide, leaving a blank crossword puzzle as an explanation. According to a european publication, The Rotarian, a note with it said: "The solution will give you the exact reasons for my suicide and also the names of the people interested."
The police asked the public if they could help solve the crossword, however no one can find a record of anyone deciphering it.
There are more death-related crosswords on societytwins.com. The puzzle was sent to this girl, Sophie Morgenstein, by her brother, right before he supposedly killed himself.She thinks it's a clue to his death and is asking for help.