Baby On Board signs originated (I think) in Germany
and were only displayed when there actually was a baby in the car. Their purpose was to alert the emergency services to the baby's presence in the event of an accident, as they could potentially be missed during a search, with 'em being little an' that.
Not the main point of your post, I know, but it does suggest a tactic you could use. Set her up by casually saying you disaprove of something that you strongly support. Then, when she regurgitates it a few days later, rip into her with a prepared argument countering the original viewpoint.
(Cave Duck, Mon 14 Jun 2010, 12:01, 1 reply, 16 years ago)

One of my friends actually does this.
I'll tell him something and a few hours / days later he'll return and tell me it in a voice of superiority.
(mr-lizard Hell's teeth man!, Wed 16 Jun 2010, 5:26, Reply)