In out first client review, MFC went with my "Food Fight" line of toys which shoot other types of food besides marshmallows. I was project manager for the remainder of the project.
One of the chosen designs was a toy which would use the energy created from adding a Mentos candy to Diet Coke to shoot the soda out a nozzle like a water gun. But before we could start design, we had to first prove this was possible and under what circumstances. After some initial difficulty, I built a prototype which achieved fifty foot shots of soda.