occasion musing on email subject lines

Today, catching up with the false positives - Postini flags roughly 20% of the newsletters and other legitimate emails as SPAM and no matter how often I try to train the program, the percentage remains about the same - I got to musing on subject lines.

Here's an example: Learn more about our permanent hair loss solution.
I said to myself, is this an ad for a depilatory? Certainly, the way it's phrased makes it seem like the product is meant to make sure hair you lose doesn't come back. I personally don't care to lose any hair.