I consider the Garden of Eden incident (the Fall of humanity) as the first case of Murphy’s Law in recorded history. I am sure Adam and Eve may agree. Think about it for a moment. God created a perfect paradise, everything was great and everyone should live happily ever after. Unfortunately when the woman and man ate the forbidden fruit and sin entered the picture; it seemed like God had to go to plan B. Fortunately this was not the case. God was not surprised by their disobedience. This was not an unforeseen setback on his part. The man and woman (and even you and I) could have seen it that way BUT Murphy’s Law does not apply to God. There are no such things as unforeseen setbacks with Him because nothing can happen outside of His purposes. He wasn’t relaxing up in heaven when suddenly red telephone started ringing indicating that there was trouble in the Garden and a sin was committed. He didn't have to go down to the bat cave and change into his super hero apparel so he could go out and fix the situation. No He was not surprised at all.
The Bible teaches about the sovereignty of God and in this particular situation God knew this was going to happen all along. It was part of the plan. God did not have to go back to the drawing board to come up with a new plan. This WAS the plan. In his sovereignty he already had a plan in place. This does not mean that it wasn’t a significant event in the early stages of creation; Adam and Eve's fall was unfortunate. It is a disheartening act of disobedience. God was upset with the situation. Because of their sin all of humanity inherits their sin nature so it is a big deal and it does affect us greatly... but God was not surprised by what happened, He had it all under control.
When Murphy strikes in my life, and he has recently, I need to continually remind myself... Ok, I wasn't expecting this, but God new it was. He knows what is going AND He has everything under control.