Ok, this one just happened to me. I was at the store getting cold medicine. As you're all aware, in some parking lots there are rows that are one way. Meaning you have to drive in that direction in order to pull into a parking spot.
Well, as I'm leaving some dipshit pulls into the row going the wrong way. It is a narrow row so we're essentially on a collision course and we both end up coming to a complete stop. I honk my horn and this lady makes the universal signal for "what the fuck?". This is apparently done by frantically waving your arms wildly in front of you.
Anyway, I pop my head out of the window and say "You're going the wrong way". She seemed confused so I said "You can't pull into a parking spot from that direction". She responds, "I'm not trying to park!".

Simple Diagram illustrating...

\\\\\\\\\\\
<--- Proper direction!
///////////

What the fuck?!

The point is, just because she wasn't parking it doesn't excuse her for being stupid and driving the wrong way.