Diet Coke + Mentos = Not so big bang

After getting all excited to put mentos in diet coke to see what would happen, it was quite a disappointment. It is suppose to shoot the Diet Coke 20 feet into the air, but no such luck for us. As I was running away from the Diet Coke it barely fizzed at all. By the time I had turned around it was already done. I am sure the neighbors had a good laugh, since we invited them out to watch. I am going to have to do a little experimenting because I want it to work. This could become an expensive experiment.