There's also the Damascus incident, where a Titan II missile silo exploded during a fuelling accident and sent a 9 megaton thermonuclear warhead out of the silo and several hundred meters away. They don't officially say whether or not the core was inside the weapon, or if it was armed at the time... Either way, it's terrifying. Humans don't deserve these weapons.
https://en.wikipedia.org/wiki/1980_Damascus_Titan_missile_ex...