Slippery slope

From Wiki Gonzalez

A Slippery Slope is when one event is said to trigger multiple following events, which results in an unacceptable result.

On BTF you might see someone arguing against a salary cap. They might say that a salary cap will lead to lower salaries, which will lead to fewer athletes going into MLB, which will lead to such poor play that MLB will be reduced to beer-league softball level play, so a salary cap is bad.

It's almost certain that a slope has become slippery when someone invokes Godwin's Law. Since nearly every invocation of this law is incorrect, it's important at this point to be prepared to point out that only a mouth-breathing nitwit would be so ignorant as to misuse the term in such a manner. This rhetorical tactic will certainly score you many points and encourage others to rally to your just and noble cause.