A lie or deception that takes on a life of its own, spiraling out of the control of the ones who started it and often mutating in the process. What distinguishes a Snowball Lie from a Fawlty Towers Plot lie is that it attracts other characters to keep it alive and expand it, either by explicitly furthering the deception for their own purposes or by sincerely buying into it and carrying it on in the honest belief that it is real -- or to avoid being embarrassed by their "ignorance" or "inexperience". An Invented Individual is a Snowball Lie based around a fictional person.