Don't show your coupon until you have the food!.
I went to the Le Peep on 95th & used a groupon coupon. We put it on the table when we sat down & we both ordered the large chicken salad. They came in large bowls filled close to the top with a few small pieces of chicken, but mainly head lettuce, not greens. When we were almost finished eating, the person at the next table ordered the same salad and it was HUGE and looked wonderful! So if you have a coupon, don't show it until you already have your food.