The Man Who Stole the Sun (1979)

A misfit high-school science teacher decides to build his own atomic bomb. He steals isotopes from a nuclear reactor and manages to create two warheads, but at the same time is present at a botched school-bus hijacking and is publicly coronated as a hero. Nevertheless, he uses the bombs to extort the police, first by demanding that baseball games be shown without commercial interruptions and then by having the Rolling Stones play in Japan despite their drug bust. Soon it's a race to see what wins first: the determined cop who's after him, the bomb he's carrying, or a burgeoning case of radiation poisoning...