A journal. Wait, I do get a pen, don't I?
Honestly, while I love learning from others, I have a lifetime of their words in my head. I need a lifetime to get my words onto paper. I would go crazy pretty quickly if I could not write.
Tom Hanks might not have found himself talking to a volleyball if he had a journal.
That said, I can only imagine the writer's anxiety of holding in my hands what might be the last paper I would ever see.