Say, I have a question for you folks.  Occasionally, I stop at the side of a 
highway in a rural area among flat, treeless or bushless fields, for various 
reasons.  Sometimes the reason is car trouble, and in that case I appreciate 
it when somebody stops to help.  Sometimes, though, I not only do not need 
help, I don't want anybody to approach.  Let's say I've got to go, or freshen 
up, and have the necessaries for accomplishing this without getting out of 
the car.  How, in a case like this, can I make the would-be good Samaritan 
understand, even before he gets out of his car, if possible, that I want 
privacy, not help?
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