Sorry to get weirdly serious on a shitpost, but I don't know if a concept does cease to exist just because you're currently not thinking about it.
That's partly the theme of the novel The Invisible Life of Addie LaRue, which argues--in quite a lovely way--that ideas have a life of their own. No one remembers Addie, and yet she still leaves marks on the world.
Anyway, have an upvote cause Ralph made me laugh, then overthink.