I actually tried freezing to death (spoiler: it didn't work). I badly tried to get any reliable information on how much it takes but couldn't find anything but clueless rumours. In winter, homeless people die though even clothed and wrapped up in a blanket. So I thought if I'm near-naked that should be enough.
So it was a winter night with -13 degrees celsius (that's 8.6 F according to the internet) which is as cold as it ever gets over here. Drove to the forest, undressed to nothing but underpants, except I wrapped up my hands and feet because I figured fingers and toes freezing off would be A) extremely painful and B) could leave me crippled if I survive. Drank a good amount of whisky to A) feel less pain and B) speed up the process of hypothermia.
Laid there for about 12 hours before it was bright daylight again and I hardly even shivered. I don't know if I would've had to wait another 1 or 2 days, but in my intoxicated state full of despair over it not working I aborted. I was thinking wtf is this, am I fucking immortal or something? I believe I was crying like never before. It seemed such a beautiful way to go but it didn't work even remotely.
Laying down in a cold stream would probably do the trick, but I imagine that's extremely painful.
Long story short, I'm not going to bother with that again.