This has perplexed me for quite some time now:
Why is it that when you pour Coca-Cola (canned or bottled, not fountain) over ice that is “fresh from the freezer” (frosty), the soda foams up much more than when you pour it over ice which has been “pre-wetted” either by water or previous cola? (slippery)
Is is some Physics or Chemistry mystery, or is it something so simple I will be shamed into silence just for asking?!