I associate the Important Nouns with the Winne-the-Pooh stories, where they are used for a certain humorous effect.
Christopher Robin was sitting outside his door, putting on his Big Boots. As soon as he saw the Big Boots, Pooh knew that an Adventure was going to happen, and he brushed the honey off his nose with the back of his paw, and spruced himself up as well as he could, so as to look Ready for Anything.
It does suggest something like a specific concept, a recognized pattern; while also suggesting perhaps a pompousness and self-importance.
I will add a fourth technique, which is the one my wife uses:
4. Whack the upper corner of the lid with a knife or spoon until it is dented in several places around the circle. This breaks the seal and makes it easier to open the lid.