Get some money from my 1st instructable.
A straight,dry,4-5 centimeter long strand of hair
Same size thread
Step 1: Step 1
Get Your Hair from a human, not animal.
Step 2: Step 2
Tell Your Friend that you can burn a thread without getting an actual flame going.
Step 3: Step 3
Ignite your flame source and hold it under the hair. the hair will pop and go up, blackened and charred with out an actual fire going. you might see a little spark on it though. then bet your friend that HE can't do it for say, a free pack of cigartes or beer or something.
Step 4: 4
Hand him the thread. when he tries it, it will light a fire. This is caused because the thread is very dry and airy. the hair has natural oil in it which will make it pop up and get burned very quickly.