If you've ever gotten the urge to stir some yogurt into your Pepsi, well, you're lucky to be alive because we're pretty sure that shit will make your stomach explode. Or maybe just turn into a super-powerful acid that eats you from the inside out (we aren't chemists). At best you'll wind up giving everyone the impression that you've ejaculated into your Pepsi.
So who would think to combine those two things and sell them commercially? Japan. Pepsi White emerged there last October just in time for their line of winter products. Because nothing screams "winter" like yogurt. Because it's white. Also, it's the first Pepsi beverage that might curdle on a hot summer day.