Forever Ain't Good

''If you want to intimidate someone with a threat, just slap the word "forever" at the end. That'll scare 'em.''

When the concept of "forever" is supposed to strike fear into your heart, then it ain't good. That means whatever lasts forever can't be undone or dealt with since it's eternal. Like with any World Domination plot, anything that suggests Forever Ain't Good isn't all that intimidating as it never happens because the heroes Save The Day too soon.