I Can't Believe It's Not I Can't Believe It's Not Butter!
Born and raised in Germany, I am thoroughly unfamiliar with products not being butter and pretending to be a perfect substitute for it. As which, apparently, I Can't Believe It's Not Butter is marketed in the U.S. of A.. Over here, margarine is just that: margarine. Brand names usually sound terribly old-fashioned, as the advent of margarine in Germany is a pre-WWI phenomenon.
There are other brands of non-butter spreads, too, but they don't pretend any butteriness either.
German margarine brands:
As you can see, pseudo-pharmaceutical names, often ending in "-san", are very common, for some sick reason I don't want to think of (did they try to make people think margarine would make them healthy?). The only margarine with a somewhat buttery name is Buttella. Alsan margarine is the only brand that comes wrapped in foil, 1900-style, which is how almost all butter is packaged in Germany.
I conclude that it would be pretty unlikely to ever have someone shout the title of this node* at a German breakfast table, and, doing so, rest my case. Thank you for your kind attention.
*This writeup was moved from "I Can't Believe It's Not I Can't Believe It's Not Butter" to "margarine". I liked the original title better, but what the hell. (2003-06-01)