And I'm speaking from my good-ol' fashioned American-bred upbringing and it's with a z, damnit! :) I fully understand the Brits' tendencies to use an s in its place, but it doesn't mean I have to like it. It's the same with things like "colour." There's no "u" in there! It's color. Deal with it! So it's you, sir, who are mistaken "about a great many things." <--- in my best Emperor impersonation.
Okay, so I know it's hard to get this across in the printed word, but I am being light-hearted in all this (or is it "lighthearted, or maybe "light hearted"?). There's differences in English spelling across this marble and I'm fine with it. Now relax and go enjoy a scone, or some blood pudding, or some crisps or whatever it is you guys eat, and I'll enjoy a nice, thick American cheeseburger and fries! :)