Before today I never chewed with my mouth open, it went against my natural chewing technique, but today for whatever reason I left my mouth slightly open whilst eating and when I realised I closed it, and I noticed something and on further experimentation I realised that the food actually tasted slightly better when my mouth was open. Maybe it's only with certain foods but sometimes the airflow enhances the flavour! Please try it yourself and tell me if you notice and differences so you can confirm if I'm crazy or not.