As a child we would intentionally make bic lighters explode. Yes they will explode. One time I also (very carefully) packed a cheap hollow (diecast metal) handle "survival" knife (with a rubber o-ring seal) tight with matches and strikers and threw it about 10'-15' in to a fence post. The knife hit blade first and stuck in the fence post and the handle also exploded on impact. <img src="/images/graemlins/smile.gif" alt="" />