Similarly, sending out a message in a bottle is the ultimate in notewriting hopefulness. I was reading on the Kircher Society's blog and they shared a pretty crazy story in this regard:
The strangest [bottle voyage] case was perhaps that of Chunosuke Matsuyama, a Japanese seaman who was wrecked with 44 shipmates in 1784. Shortly before he and his companions died of starvation on a Pacific coral reef, Matsuyama carved a brief account of their tragedy on a piece of wood, sealed it in a bottle, and then threw it into the sea. It was washed up 150 years later in 1935 at the very seaside village where Matsuyama had been born.
Whoah, what a coincidence! So, if you could write a note to your great grandchild, what would you say?