Last time I stopped to help someone was an old lady in a Lincoln Town Car, who had a flat tire. I approached her window (in broad daylight, on the side of a fairly busy county road), and she cracked it ever so slightly.
"Hello ma'am. I see you have a flat tire. Would you like some help?"
"Mm hmm." (eyes straight ahead, hands gripping steering wheel tightly, no other response)
"Uh... you want help? Want me to change the tire for you?"
"Mm hmm."
"Uh, OK - can you pop your trunk, please?"
"Mm hmm." [quickly reaching down to pop trunk]
I got out her spare tire and jack set, and changed the tire in about 5 minutes. When I was done, I put the flat tire and jack set back into her trunk and closed the lid. Then I went around to her window:
"OK ma'am, you're all set. You'll want to take that tire to a tire shop and have it repaired."
"Mm hmm." [rolls up window, starts car, and drives off, leaving me standing there with a surprised look on my face]
Good on ya.
She might have been related to the Crash Test Dummies?
http://www.youtube.com/watch?v=yhuPiBZHvLE