Slightly off topic but in the same vein - how do lunch shops/snack bars etc get away with saying buttered toast, buttered roll and so on when it's margarine!!! Surely this is straight out false advertising. Ever since margarine became the 9th Wonder of the World and was going to lower everybodys cholesterol rates and heart attack figures (which it hasn't) you can't get real butter in these shops. And yet, when you go to any sort of self serve food place there's usually a basket of foil wrapped squares of butter near the bread rolls and margarine is nowhere to be seen. (Maybe because you can't make a square of margarine? I dunno.)
I recently had a conversation with one of these food shops that sell baked jacket potatos and one of the fillings was butter, cheese etc. I asked if it was real butter and he asked his wife out the back who assured him it was, so I ordered the spud. Meanwhile the wife bought the 'butter' out to show me and it was marg. When I pointed this out she asked me what the difference was. When I'd stopped looking in disbelief for a few moments I explained that apart from the taste, butter is made from cows milk/cream and marg is made from oils, chemicals, colouring etc.
They were lovely people and very apologetic for not having butter and offered me my substitute food for free which was nice of them. Usually when I quiz food shops about the use of the word buttered when it's marg I'm met with defensiveness and frosty replies like I've accused them of cheating or something.