On 20 March 1995, cult members released the sarin on the subway in the Japanese capital. They left punctured bags filled with liquid nerve agent on train lines going through Tokyo's political district.
I saw a scary-looking documentary about the cult on TV when I was a kid. My mother didn't wait to warn me not to come into contact with "people like that".
I don't remember anything about it except for the interesting-sounding name and a vague image of its Japanese leader. The closest I've gotten to cultists was Jehovah's Witnesses knocking on my door, asking what I thought was the problem with the youngsters of this generation.
I asked them what did they want, being too polite for my own good. When they started - confirming every suspicion I had - I said I had no time for this. My apartment was being worked on at the time. Otherwise, I might have stuck with the topic and enjoyed the conversation.
While they probably didn't set off a nuke in the Outback, the fact that it took a congressional investigation to say "there's no evidence they did" indicates that they had some real ambitions to Bond-villain-level nefariousness.