Back in junior high my buddy thought it would be a good idea to try this. One whack with a hammer and the primer went BANG!! The anvil of the primer lodged in his head in his eyebrow. MAN did he bleed. Walked him into his house and had to try to explain to his mom what happened. That was not the end of our escapades however. In high school we built CO2 cartridge bombs. Fill them with gun powder, use a waterproof wick and seal with candle wax. It'll blow a toilet clean out of the floor. Don't ask....