Funny story here
Last year I was up past 100 mile house hunting moose.
I was in the summer weight tent mentioned above that I had put a tarp over to keep the wind out. Its a dome tent about 7 feet in diameter and about 5 feet high at the center.
My youngest brother was in his 3 season dome tent with a propane heater.
My nephew and one of his friends were in a large cabin tent probably 12x12 or so.
The first night it reached -15 to -20 celcius, my nephew was freezing.
Before he went to bed he lit 100 tea candles and put them on a stand in the tent trying to warm it. I felt sorry for him so I gave him 5 wool blankets to use as well.
Without saying anything he decides to go Jeremiah Johnson on us and takes a couple of rocks out of the fire and puts in the foot of his bed. He then goes to bed, about 45 minutes or so latter we hear him yelling at the top of his lungs.
The blanket he wrapped the rocks in (polyester blanket) had caught fire. He managed to put it out right away, but his blanket was ruined.
He wasn't hurt but man it was funny, the only bad thing was he ruined two of my wool blankets.