A simple DIY vibrator/ThighMaster mashup.
We love the totally non-sexy Instructables.com feel to the homemade sex toy site that invented this.
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.