A Trope Trope, which rears its ugly head to everyone eventually, clouding the mind, making a Troper unable to think of something that was just on the tip of their tongue, and afflicting a normally productive YKTTW session in any number of ghastly drains upon the brain. For example, you could have: Occasionally pertains specifically to examples, with cases such as: * Knowing an example of the Trope but can't remember the name of the book / story. * (much less often) Knowing an example of the Trope but can't even remember what medium it was from.