LOL I remember when I first started to McDougal and I stupidly assumed if it was rice it was gluten free... and got a contaminated package of cheap rice.
Oh yea 4 weeks of getting my stomach healed up, Why, you ask.. because I kept eating the rice thinking it was something else.
Oh yeah it was a sad state of affairs.
Or those items that you eat and that have nothing in the label that would show you there is gluten in them (Salad dressings being a huge culprit) and you eat them only to have your stomach go into major defense mode.
or my ultimate favorite it is gluten free but processed in a plant where gluten items are processed. oh yeah Love that one.