This is an old idea I had some time ago. Thinking back on it, I realised it fits rather well with the current theme of inverting SCPs, but I did not intend it to be that when I thought about it (I'm not even sure I had yet read the SCP of which it could be an inversion).
The SCP is a small object, possibly of a very simple shape (I had thought it as a cube, but geometrical shapes seem to be frowned upon, so it may as well be a pen eraser or a plush toy). People exposed to it will become obsessed by it, and keep examining it over and over. If they are removed from the SCP, they will keep describing the object in excruciating details, in whichever media they are comfortable with.
An intellectually-challenged D-class may for instance talk about it at length with his own vocabulary, while a researcher will write papers after papers for describing this SCP. The effect may wane slowly after time, but affected subjects will keep referring to the object in their everyday conversations or written materials.
A side effect of this is that the Foundation now possess an extremely extensive documentation on a very common object that has no other special properties.
