You can't invoke it either. It's a statistical observation.
As the length of any internet argument grows, the probability of anything being said would approach 1.
Taken from Wikipedia;
Godwin's law itself can be abused as a distraction, diversion or even as censorship, fallaciously miscasting an opponent's argument as hyperbole when the comparisons made by the argument are actually appropriate. Similar criticisms of the "law" (or "at least the distorted version which purports to prohibit all comparisons to German crimes") have been made by American lawyer, journalist and author Glenn Greenwald.
Godwin's law does not claim to articulate a fallacy; it is instead framed as a memetic tool to reduce the incidence of inappropriate hyperbolic comparisons. "Although deliberately framed as if it were a law of nature or of mathematics, its purpose has always been rhetorical and pedagogical: I wanted folks who glibly compared someone else to Hitler to think a bit harder about the Holocaust", Godwin has written. In December 2015, Godwin commented on the Nazi and fascist comparisons being made by several articles on Republican presidential candidate Donald Trump, saying: "If you're thoughtful about it and show some real awareness of history, go ahead and refer to Hitler when you talk about Trump.