I've heard of an incident in the mid 60s: someone was testing a space suit in an vacuum chamber, the suit depressurized and the man fainted after feeling the water in his mouth begin to boil.
It's a good story but I am wondering : does that really happened ?
A quick search in the nasa website didn't gave me anything (maybe i was just using the wrongs key-words)
Does such a story ring a bell to anyone ?