I went to the store yesterday. Diet Pepsi was on sale but Diet Coke was not. So I bought the Diet Pepsi. I usually buy 2 litre bottles. The thing I noticed though is that while Diet Coke pours smooth into most of my glasses, leaving lots of dissolved carbonation, Diet Pepsi reacts as if the glass were a glass made of mentos. Why is this? Is there a difference besides taste between the two major brand's diet beverages?