I once let my hair grow back a bit on my legs so that they were long enough to wax before going to a 3 day rave in central Australia. It was going to be a week long road trip including there and back so I didn't want to have to shave.
In the van on the way up I noticed that I'd missed a big patch on the back of my leg and I don't risk sharing other people's shavers. I grabbed a friends cigarette lighter and carefully burnt the hair. I didn't even burn my skin and the patch was silky smooth.