Detractors of I Can't Believe It's Not Butter!® say that the product is so obviously inferior to real butter that no one in their right mind would actually say, "I can't believe it's not butter." This is not strictly true. I personally know of at least two instances when this phrase was used, though perhaps not in the way the manufacturers intended.
First instance: A few months back, having gone to the supermarket to buy butter, I bought a tub of I Can't Believe It's Not Butter!® by mistake. When I got home, I realised my folly and exclaimed, "I can't believe it's not butter!"
Second instance: Anasua looked in the fridge and said, "What is this crap you've got? I can't believe it's not butter!"
Anyhow, owing to our extreme reluctance to throw food away, we bit the bullet and finished it (mostly by consuming it as a substitute when we ran out of real butter). But
as is my wont, I retained the tub for storing real butter.
The problem was that in the course of our epic struggle to finish I Can't Believe It's Not Butter!®, we had grown to loathe the sight of the tub itself. It seemed that anything stored in that tub, even real butter, would seem unappetising. So I have covered the repulsive packaging (see top left photo) with a home-drawn replacement that leaves the beholder in no doubt about the contents of the tub.