When the Israelites complained that they did not have food in the Wilderness of Sin, God told Moses, "I will rain down bread from heaven on them and they shall go out and gather a certain quota each day so that I may test whether or not they will follow My laws. For on the 6th day they shall prepare what they collect and it shall be twice as much as what they gather." (Exodus 16:4-5)
Moses then spoke to the Israelites and told them to collect 1 omer for each person in their tent (Exodus 16:16) and not to leave any of it until morning. (Exodus 16:19)
So God wanted the Israelites to collect just enough Manna for each person in their tent from the 1st to 5th day of the week and not to leave any of it until morning because if they did it bred worms and produced a foul smell. (Exodus 16:20)
But on the 6th day they were still collect the same amount but when they prepared it, it would be twice as much so that it could feed them on the 6th and 7th day.
He gave this "crazy" instruction of Collect Manna on Day 1 to Day 6 but do not store it overnight except on Day 6 so that He could test the Israelites and see whether they would obey Him.
So if God gives you a "crazy" instruction and you are wondering "Why?!!" understand that He could be testing you to see whether you will obey Him.
We can see another example of a "crazy" instruction that may have left a person wondering "Why?!!" when He told Abraham to sacrifice his son Isaac because Abraham was 100 years old when Isaac was born (Genesis 21:5) and he and Sarah had waited for many years for this child.
In addition, at that time Abraham had already sent the son that his wife's maid Hagar had borne him away. (Genesis 21:14) Therefore sacrificing Isaac would mean that he and Sarah would be left childless.
However Abraham obeyed God without asking "Why?!!" and he reaped numerous blessings because of his obedience.
Therefore, the next time God gives you a "crazy" instruction, instead of wondering "Why God Why?!!", just do it and you will reap the blessings of your obedience.