Believing you can transform yourself into various other shapes or beings, and that if you don't get them what they want they will change into the most dangerous shape they are capable of, and presumably do a great deal of harm to everyone.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.