This is what happens to your tongue when you eat Chucky Larms.

It turns blue. That's why we only eat Chucky Larms once a week. :-)

I used to have a boss who wouldn't let her kids eat anything blue. She said it was not a naturally occurring color in food (um...blueberries?). In fact, she was serious enough about the ban in her home that she would pick out the blue M&Ms and throw them away.