1. They wash off (important).
2. You don't have to put them away. Drying out won't hurt em a bit.
3. When you use them to paint your toenails, Mom doesn't get mad. (See 1.)
4. They create the most interesting art. (Heavy on the blue this time.)
5. If you eat them, the only one who sees what happens internally is mom, and hey, she wasn't watching in the first place, so it's sort of her fault, right?