Media to write

What's the best media to write down your inspiration?
The answer is.... anything.
Pocket note, is easy to carry anywhere you want.
Tissue paper, can be usefull while you haven't any paper to write. Because you've never want to loose your sudden inspiration.
Book, more effective because you can write many things.
Cell phone, good choice because it is something you can't left behind.
Notebook, best media to save, create, and manage things.