here's Destin from smartereveryday experiencing hypoxia. he's told to his face that he is going to die if he doesn't put his mask back on and get some oxygen, yet the whole time he has a giant grin on his face
I'm staunchly opposed to the death penalty, but if you're going to kill someone nitrogen induced hypoxia is one of the most humane ways to do so.
Forget 75°, just 65°C (150°F) will give you third degree burns in 2 seconds:
(°F)