• Tsar Bomba. The most powerful nuclear bomb ever detonated. The winner of the i-can-piss-further contest between the americans and the russians.

• Demon Core. A bunch on uranium plutonium that managed to kill 2 scientists.

• Tsutomu Yamaguchi. A survivor of both the Hiroshima and Nagasaki attacks.

Update 2009-09-14: As it must be evident, I can't read and quote properly a text. Corrected killer material.