TRY A MAGNIFYING GLASS ON A SUNNY DAY
This works well to ignite a pipe or bong but not a joint. it takes a few secs to get the angle in relation to the sun right and the distance between your pipe and the glass (you get the idea, you used to burn stuff with a magnifying glass when you were a kid too right?).
This is a great tasting method... no butane or match flavors. In fact with a clean pipe this could be the best way to sample the true flavour of weed or hash when a vapourizer cant be used.