I remember one of the flowchart responses to people questioning the biblical flood was something along the lines that "every culture has a flood story".
Of course, nearly everywhere has flooded at one time or another and we know there are minor floods and then there are the 1-in-1000 year kind of weather event, that tend to get a mention (anyone from the UK will still talk about the summer of '76, and that's probably nothing in comparison to a decent flood).
But the inference is that the flood must be real, because every culture has a flood story.
The best response is "now do dragons".
Because apparently, nearly every culture also has a dragon legend.
Does it mean dragons exist? Some desperate JW may show their ignorance by suggesting that man lived at the same time as Dinosaurs and they are what the stories were based on. Fun fact: Stegosaurus was a fossil when T-Rex was alive for longer than it's been since T-Rex has been a fossil to us - we're talking OLD, and no overlap (ignore the map in the cover of the old green bible).
Do JWs still even bother trying to defend the cray-cray aesop-fable kind of OT beliefs?