Not much we can do about nuclear war... just make sure our souls are ready to meet God.
I knew a trad years ago who used to joke, whenever the specter of nuclear war seemed closer than usual, that he "needed to buy another gun". He knew he was being silly.
We got a good laugh out of it. What, are you going to shoot down the nuke as it flies overhead, right before it detonates on your city?
There's something funny about it. Here's another version, same joke:
On the news, a man says that there's an asteroid coming, which will strike and pulverize the earth. A man gets up from his chair immediately and says, "I need to go buy more toilet paper."