Take two anvils, a couple steel plates, a cardboard gasket, a length of fuse and a lot of black powder. Voila: anvil launching. Watch as Gay Wilkinson, champion anvil launcher, blasts his solid iron anvils 200′ in the air with this setup.
Note: Please do not take this post as a recommendation that you should attempt to launch your own anvil (or anything else, for that matter). Black powder is terrifyingly explosive – even the hardiest professionals are frightened by it.