Urban legend highlight: Can explode in your stomach and kill you
Believability rating: 2

Mentos might be the freshmaker, but according to this urban legend they are also the "death maker." In 2006, two children from Brazil apparently died from ingesting Mentos and Coke simultaneously. Stoner experiments have proven that dropping Mentos into a bottle of Diet Coke can make it erupt like a junior high science fair volcano. Diet Coke makes the biggest geyser, with aspartame lowering the surface tension in the soda and making it erupt more impressively. While everyone warned against the dangers of such a combination, no one actually had any real evidence that these children passed on from a deadly, bubbly reaction. However, there is also no evidence that they didn't, so it might just be safer to walk around dehydrated with bad breath. Just saying.