Q: How do you make a fire with two sticks?
A: Make sure one of them is a match!
Explanation: This joke only works if you know what a matchstick is. If you have a match or a matchstick you can easily make a fire. This joke leads one to think that the answer will be “rub two sticks together” but that would be too much work for a joke.
Here is a link to a Jack London story, To Build a Fire: http://www.jacklondons.net/buildafire.html
If you want to build a fire by rubbing two sticks together you could try this: