I've told my family that if I'm ever in a hospital bed due and seemingly unresponsive due to injury or illness, to check whether I'm not trying to communicate (using eye movements, finger twitches, or whatever) in morse code.
[1]: https://en.wikipedia.org/wiki/Johnny_Got_His_Gun
[2]: https://en.wikipedia.org/wiki/Johnny_Got_His_Gun_(film)
Wrote a memoir by blinking at the right time going through the alphabet ordered by frequency