hook a duck

My sister volunteered our services at the Cub's summer fair. We were given control of the hook-a-duck stall. It wasn't strictly hook-a-duck. It was hook-a-paper-bag-with-a-picture-of-a-duck-on-it. It was so easy that our prizes ran out after 45 minutes and we were free. Result! 
The woman on the next stall wasn't so lucky. She got the Hoopla. This involved throwing a hoop over some tins of food and winning what it landed on. As no-one in their right mind would possibly want to win a tin of supermarket own brand sausage casserole her stall wasn't so popular. Shame.