Well, the way to make a matchbox-bomb (yes, an explosion) is to:
1) invert matchbox (so stiking surface is on inside of box)
2)place match heads inside box
3) wrap very tightly in electritions/insulation tape
4) throw very hard on hard surface
5) run away very quickly from angry adults

Yep, I know that making those was very foolish. I am still young and foolish - probably because i run fairly quickly <img src="/images/graemlins/wink.gif" alt="" />