Once upon a time, a Ohio resident and a Michigan resident went to Heaven, and God granted them each one wish. The Michigan resident said "I hate living next to the Ohio so much I want a wall 10 feet thick and 50 feet tall around the entire state of Michigan." God snapped his fingers and POOF! There was a wall 50 feet high and 10 feet thick around the entire state of Michigan. Then it was the Ohio resident's turn for a wish. He said: "Can the wall hold water?" and God replied "Yes, it certainly can." Then the Ohio resident said "Fill that wall with water."
It's a long way to Ann Arbor, so please remember to flush twice.