If there is one thing that this chapter teaches us, it is that there are lots of things about this life and about the future that will remain a mystery to us. And that is good, God always knows what is best. 

When the fifth trumpet sounds an angel is flung from heaven with a key. He opens the abyss and out of the smoke from the abyss appears creatures, locusts with scary features and scorpion stingers. They are given the task to torture all people who do not have the seal of God. 

In this crazy story Saul offers his daughter to David in marriage, but it is a trap. Saul would require a very interesting payment in exchange for his daughter: 100 Philistine foreskins. It might seem crazy, but for David this is an attractive and easy deal.