If I'm not sure that somebody's Dutch ... There's two fool proof ways to tell:
1) Listen for the language. If your first reaction is to try stop them from choking, they're probably speaking Dutch. For us native English speakers .. those are some tough sounds to make. Wish I could speak more Dutch
2) Just say as you walk by "Ik bent stoned zein" (I have no idea how to spell it) ... If they flash a great huge smile, they're Dutch.
