Why can't you just use a 555 timer as an monostable pulse generator to drive a power transistor to drive a speaker? I hear that kind of pop all the time when I turn on my speakers using my powerbar rather than the switch on the back of the sub.
I vote for ignitor and explosive device. I also like Boncuk's suggestion but just my love of explosives leads to my choice. I think I still have a few firecrackers from the July 4th weekend around here too!