I went to a friend's (or maybe a friend of a friend's) after party a few months ago. We were drinking cocktails, Crown and Diet, specifically. I commented on the deliciousness of the drink and he told me we were drinking Cask 16 in our coke!

I was horrified, but didn't want to be rude so I kept mum, except when he got up for the next round I said "Go easy on the diet, less than a splash please." Good stuff.