Customer Honesty

So at work yesterday (Saturday) we were pretty busy, and in the middle of a pretty big rush, I was walking over to the fudge station and out of the corner of my eye thought I saw a lady take a piece of chocolate out of one of the cases.  It has a sign on it that says THESE ARE NOT SAMPLES but we still get people lifting the lid. =P So anyway, I had another customer to help and I was across the room, so instead I watched to see what they did.  The lady's friend was in the process of grabbing a piece when she gasped, Oh, these AREN'T samples!!  And very (not) stealthily put it back as the original lady froze with the chocolate already in her mouth.  As I walked back with my customer and their fudge to the other register, I heard the lady with the chocolate talking to Mackenzie.  She was apologizing for the trouble because the piece she had taken was actually one with no set price and would have been weighed, but Mackenzie just charged her the standard price for pieces that size, and she kept saying that she hadn't seen the sign.  Mackenzie and I told her it was really okay, and that it was nice of her to tell us and pay for it anyway, because a lot of customers don't
"Well," she told us

"I couldn't do what was wrong."

I have no idea who she was, but the fact that she already knew that she just couldn't let herself make that wrong choice stuck with me, and I appreciated it.