Which equally unstable head of state will take The Donald up on his threats? Someone is gonna call his hand and go all-in. What then?

That's the scary thing, someone is going to tell him to shove it, and he will react, or he will threaten or belittle someone and they will react.  I am really afraid of what would happen if he talked to Kim from North Korea.  True, we would then find out if Trump wants to be King of the World.  Wipe North Korea off the map and tell everyone else get in line or this will happen to you..