If you go to the Ohio State Fair, you have to visit the dairy building and buy some ice cream. Beware though--if you ask for two scoops, you will receive about a pint of ice cream. It is hard to eat it before it starts to drip. But it is SO good on a hot Ohio State Fair day. You can order chocolate, strawberry, or vanilla and sometimes other flavors. My favorite is strawberry.
While you are in the dairy building, take a look at the Butter Cow display. This years display honored the Wright brothers. Also, you can purchase various "Got Milk" items, like a cow, "Got Milk" apron, tote bag, etc.
But the ice cream is delicious and they serve very generous portions. If you go to the Ohio State Fair, you must get some ice cream.