Here's a trend that's far more disturbing than your average casual encounter ad:

Women are selling, or in the market for, positive pregnancy tests on Craigslist.

In the last few months, a growing number of listings have been popping up on the classified ad site selling these baby prognosticators for roughly 25 to 30 dollars a pop. And these aren't for fleeting practical jokes. One listing reads, "wanna get your boyfriend to finally pop the question?"

Another woman is in need of a positive test to get back at her "cheating lying dog" of a boyfriend.