But pop rocks at 15km when you've just been blown out of a malfunctioning space vehicle still strapped to your chair while you're tryi to unbuckle it so you can pull the shute.
The context is an account of an incident in a NASA vacuum testing chamber where a tester's suit lost pressure, not of the crash.
I'm quite certain both experiences on the whole would be terrifying, but as the detail of the saliva boiling on the tongue was singled out to be terrifying on its own, that is what I based my comment on.
In my imagining of what it would feel like to have your saliva boil yet not be under a great amount of heat, I can only imagine it would feel like a mouth full of pop rocks. I don't find that terrifying.