Once it's in this new form it is very easy to believe it's not butter. If they put "I can't believe it's not butter" in a foil wrapper, thereby increasing it's initial resemblance to butter quite substantialy, there would be people all across the globe, everywhere south of Spitzbergen anyway, crying into their cornflakes as they awake to find that the "I can't believe it's not butter" has spread itself all over the kitchen table, chairs and floor.
While it's in a tub, "I can't believe it's not butter" is reasonably well contained, and relatively safe. However, if your girlfriend is Nicola Skinner, who never puts anything away, and has left the "I can't believe it's not butter" out all night, then you must beware picking up the tub when ready to spread your toast or else you may find fetid, yellow custard-like liquid running down your bare leg and inbetween your toes.
Although you may be at first annoyed at this turn of events, the experience of being able to pour your dairy spread over your toast it not to be missed, believe you me.