Well funny if you aren't my friend...
He has three kids, each of whom have a DS. The youngest (4 years old) couldn't find the stylus -- so what does she do? Takes a safety pin of all things, unhooks it, and plays for a couple hours with that. Completely destroys the screen of course.
I think my friend knows how to replace the screen, so at least the DS isn't done for (unlike the one dropped in water and the other one that just plain got lost).