When I first heard about The Nipple Gauge, I didn't quite get it. It's a credit card sized plastic measurement device for seeing how your nipple size compares to other people's. And I thought "Why on Earth would a woman want to measure the size of her nipples?"

Then I visited the web site, and saw this selling line, and I realized I'd been thinking about the wrong end-user completely:

The Nipple Gauge is a credit card sized device used for measuring, you guessed it, nipples. Getting her top off has never been easier... It's cheap, it's funny, and it WORKS!

There's genius at work here.