Slippery Slope

The slippery slope fallacy, also known as the domino fallacy, occurs when an argument asserts that a relatively small first step will inevitably lead to a chain reaction of negative or catastrophic consequences, without sufficient evidence to support such a claim. In essence, it suggests that taking a single action will set off a chain of events, each one more extreme or severe than the last, ultimately leading to a disastrous outcome. This fallacy is problematic because it lacks a logical connection between the initial action and the extreme consequences, and it often relies on fear or emotion rather than sound reasoning. 

Examples:

"If we allow people to own any firearms, it will lead to a situation where everyone can own military-grade weapons, and society will become a war zone." 

"If we let students use cell phones in class, it's only a matter of time before they're all addicted, and education will be ruined." 

"If we legalize recreational marijuana, it will lead to increased drug abuse and societal decay."