Rabbi Larry Kushner retells story that he also tells in his book The Book of Miracles. The rich congregant wakes up convinced that G-d has told him to bake 12 loaves of challah as a gift to G-d. He does so, but where shall he put them. He settles on the ark in the synagogue. Later the poor David comes in an prays that he has nothing to feed his family. He opens the ark and low and behold, there are 12 loaves of bread. It's a miracle! This goes on for weeks and weeks. Maybe months and months. The rich man bakes the bread, the poor man discovers the bread. And one day the rabbi spies the exchange...find out where the miracles really are.
Recently we used this with our littlest kids...and we hid Hershey kisses in the ark. It was great fun and really poignant.
Edit: This past weekend, we again used it with our littles. This time, to emphasize acts of lovingkindness, we had the kids bake cookies, one to eat and one to donate. The donation plate got hidden in the ark for the Shabbat morning crowd. Very effective. BUT one little kid said "I'm not sure about this book." He felt the pictures were too dark and scary.