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a simple pipe bomb can probably be built for $20.
Rescue 911 - 1989 Pipe Bomb 3-24 was released on:
USA: 29 April 1992
Ron said that he found the source of the ticking. Then you could see him holding up a fake pipe bomb. So the answer is: A pipe bomb.
An Empty CO2 Cartridge, The Heads of many matches, and a fuse.
Atlanta