When you were a kid, did you ever make one of those exploding volcanoes with baking soda and vinegar? If you did, you'll appreciate what happened to my neighbor (swear to God it's true, I was there) ...
She made chocolate chip dough from scratch, which includes baking soda. And then ate most of it raw. And then drank about 2 liters of Pepsi. Apparently the Pepsi reacts with the baking soda the same way those homemade volcanoes do -- lots of gas and bubbling and foam.
She thought she was going to die for a couple of hours until it all settled down.
Jiff, I bake for DH. He's lactose-intolerant and can't eat store-bought baked goods. So we've always got cookies in the freezer.