http://health.msn.com/centers/heartburnandgerd/articlepage.aspx?cp-documentid=100110624>1=8450
Some interesting facts about how gas works, what it's composed of, why we get it, etc. Also, it points out that peppermints, chocolate and fats can cause burping. Which most people with trapped gas would like to do. It suggest sucking on a peppermint candy to try and relieve gas. I would think sucking on an after dinner chocolate mint would be really good! Also note they suggest baking soda in water if you are having gas problems, although it's not to be take directly after a meal.