An event where an individual or a group of individuals perform an action that is not considered "normal" as the event does not go according to the original plan. (Also known as a "Fail") Now, when an individual(s) perform an action that defies the laws of logic and are along the lines of retardness and a complete LOL maker, it is considered a Feil.
Fei: the movie was so previdible!
Ruu: previdible? What's that?
Fei: Prevedibol? Predivtable?