Friend's dad did that and burnt his butt.
Pretty dangerous, and also not the cleanest thing to do.. lol
I think burning your hair sucks more which I have encountered once..
I forgot my deoderant at where I had traveled, and came back to find just a deoderant stick with a missing cap.. Soo I used a knife to take the dried up part off and used the deoderant.
Repeated for like, a week, then I was playing with axe. Burning it.
Then smarty pants-ss moose sprays it into the trash can with a lot of deoderant already in it, then lights a match.. POOOOOF. Burnt some bangs, my hair on my arms, and also my nose hairs. Thaaat sucked..