diet coke + mentos

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if you look at youtube or similar site you can find some interesting videos about the reaction between diet coke and mentos.. infact if you put tre or four mentos into a 2lt bottle of diet coke you can watch to a strange jet of coke but why there is this reaction?? is it dangerous to eat some mentos and after drink some diet coke?? have you ever try to do this experiment with coke and mentos??