Years ago, when I was still in, I went to an Irish pub (in the Netherlands) with my family. We ordered their regular meal, with things like sausages, beans in tomato sauce, mashed potatoes... and the menu also said 'black pudding'. Now you must know that the word 'pudding' in Dutch means 'dessert'. So we figured 'black pudding' is some kind of desert. We ate our meal. And there were some round 'thingies' on our plates which the children didn't like, and my (then) husband and I thought it tasted a bit weird with a lot of clove but we just ate it (that's probably Dutch... you eat what you've paid for )
When we finished our meal we were waiting for the dessert... but it never came. So we asked the waitress "we're waiting for the black pudding"... and then she said "you've had it!"... We probably looked really stupid, but then all of a sudden it 'hit us'... those weird 'thingies'... that was the black pudding! And then it started dawning to us that we might have been eating blood... We asked the waitress what 'black pudding' is made of... and to our disgust she said 'blood' (amongst other ingredients which we didn't hear anymore!). I had to do my utter best not to vomit in the middle of the pub!!
As I said, we were still JW's, so we felt very guilty for a while, but we really had no idea, so who could blame us??
Ever since I have never had black pudding, blood sausage or anything like that again. I do eat liver every now and then, and I love a medium rare steak, but that one experience with black pudding has made an impression!
Luckily my new husband doesn't like it either...