One time in high school, my best friend decided she wanted blue hair. Well, there was no where within 50 miles that she would be able to buy blue hair dye. So, she decided to use Rit. You know, the clothing dye? Here's where the brilliance comes in:
To rinse it out, she took a shower. Yes, it stained her whole body except her face. She took so much ribbing for this at school! Oh, it was hysterical! After school that day, she came over to my house. This was at the end of the school year, so late May/early June. She decided she was hot and jumped into my parent's pool! The whole pool turned blue!
That was 10 years ago, and we still tease her about that!
Moral of the story? Be glad it's just your mouth and hands.