I was brought up on a lot of offal so I really like it. Beef heart, lamb heart, lamb or pork kidneys, lamb and chicken livers, blood sausage / Black puddings of all kinds. I'm not so keen on the texture of brains but my wife likes them, especially middle eastern style, in all the spices.
Chicken livers are a really great cheap meal actually as the celebrity chefs haven't quite started pushing them yet. 3 quids worth gets you enough for 3 people, mix with some olive oil, cumin, garlic, chilli flakes and salt and fry them til done. Make a simple flatbread to go with them and serve with some hot sauce and garlic yoghurt, delicious.