Here's a conversation with my JW MIL a few months back:
JW MIL: The JWs have never changed anything with regard to their teachings!
Me: That's not true, you couldn't have blood fractions before, now you can. Did you know that blood fractions come from blood?
JW MIL: So what, it's only a little bit of blood.
Me: What! A little bit of blood?!?! Why don't I just commit a little bit of fornication!
JW MIL: (speechless)
Priceless