Dairy stuff just shouldn't fizz

Here in the features department of the Daily News newsroom, we have the privilege or pain from time to time of sampling new edible products. Today's kid-friendly item: A yogurt tube (uh-huh) with odd-colored contents (been there) and hyperbolic flavor names ("Blue Raspberry Rage" -- ho-hum). But this stuff from Yoplait, called Fizzix, actually has something in it that reacts on the tongue kind of like out-of-date Pop Rocks candies.
Kids who want every gimmicky treat that ever landed by a checkstand will like it, and the flavor wasn't bad. Here's the catch: The fizzy element goes into overdrive after the packet has been out of refrigeration for a while, so that even while the tube is still cool to the touch, it looks like it's going to rupture. I was tempted to let it sit on my desk for an hour or more to see what would happen (In the name of work-related research), but they'd probably make me clean that stuff out of my keyboard myself. Even without the rupture, the moment the tube was opened, it began oozing blue goo.