When you watch Doctor Who, and you put your fingers on the sides of your head(like devil horns).

An idea you thought you had, but someone else has already come up with.

“Constervusion,” was invented by Troy W. Gunter on August 2, 1984.

When a person has an idea, but has a brain fart, and can’t remember the idea. (Constervusion was invented by Troy W. Gunter on August 2nd, 1984.)