push button to turn your handlebars 90 degrees, then they lock back:
Originally Posted by from article
Not only can handlebars poke passers-by, but they also have a tendency to whack into door frames, and they prevent your bike from resting stably against walls. Loosening your handlebar stem and turning the bars parallel with the front wheel, while addressing the problem, is likely more work than most people are interested in doing on a daily basis. With the new flipphandle stem, however, riders can turn their bars sideways with just a press of a button.
He's prototyping them for $75 at the moment, but once he gets going the price should drop. Keep your eyes open for these!
Here's the creator's site, he has a vid too: Here
Where I saw this