This reminds me of when my wife was driving in the left lane and some guy behind her was flashing his lights at her. She was getting pissed off at him, until I told her that she should really only be in that lane if she was overtaking (she wasn't). Then she got pissed off at me and said she'd never heard that rule before in her life, she passed her test first time and had never heard anything so ridiculous before. About 5 minutes later she was pulled over by a traffic policeman who asked her why she was cruising in the left lane when she wasn't overtaking and then proceeded to give her a lecture about how the left lane was for overtaking only.
I felt really bad for her, but I also couldn't help feeling just a teensy bit smug too.
