That would be the entire premise the Invisible Pink Unicorn
is lampooning. Unless you, yourself are being sarcastic which would mean my internet interpretation filters are faulty.
Though personally I prefer Russell's teapot for an analogy on the need for a theory to be falsifiable.
The point was not to bring up something unfalsifiable, but to bring up something unrealistic, to demonstrate that just wishing it were so is not enough. In the broader context, I generally prefer the invisible pink unicorn to Russell's teapot, however, as Russell's teapot is never quite interpreted properly. Dawkins' invisible garage dragon is also pretty good. ;)