A little boy is telling his Grandma how "everything" was going wrong in his life. His school teacher gets mad at him, the other kids tease him, his bike broke, and his parents make him do too many chores, etc.
Meanwhile, Grandma is baking a cake. She asks the child if he would like a snack, which of course he does. "Here. Have some cooking oil."
"Yuck", says the boy.
"How about a couple of raw eggs?"
"Would you like some flour then? Or maybe baking soda?"
"Grandma, those are all yucky!"
To which the Grandma replies: "Yes, all those things seem bad all by themselves. But when they are put together in the right way, they make a wonderfully delicious cake! God works the same way. Many times we wonder why he would let us go through such bad and difficult times, but God knows that when He puts these things all in His order for your learning, they always work for good! We just have to trust Him and, eventually they will all make something wonderful!"