6. "Hitler!" Ha! The thread is over!
Nope, doesn't work that way. Not only is it wrong to say that a
thread is over when Godwin's Law is invoked anyway (Usenet threads
virtually always outlive their usefulness), but long ago a corollary to
the Law was proposed and accepted by Taki "Quirk" Kogama (quirk@swcp.com):
Quirk's Exception: Intentional invocation of this so-called
"Nazi Clause" is ineffectual.
Sorry, folks. Nice try, though.