Here is how it happened:
Someone asked a member of the gb: "What do we do when armageddon happends?"
The GB member told the other GB members. after they stopped rolling around on the floor laughing, they told the dude: "Just go to the basement"
he said: "oh.. but what about food and stuff? what if the UN attack us?"
they said: "just bring a watchtower, jehovahs angels will use it to swat the UN soldiers, and there will be plenty of flying pigs to eat in the underground lair".
...and so the word spread...
if there ever was a rumor nobody had any interest in dismantling!