JWs

A couple of Jehovah's witnesses knocked on my door last Sunday.

I asked, "Is it true you people don't believe in blood transfusions?"

One if them said "That's correct sir."

I said "That's a shame."

The other one said "Why do you say that?"

I said "Because

Spoiler:

if you bang on my door again at 8.30am on a Sunday morning you're both going to need one.