I was at a rave last year and my mate Scott's wee brother ate a tin of haggis cold for his breakfast! It was the funniest thing I'd ever seen! Personally I don't like the tinned stuff as much, you're best to get a MacSween's one from a supermarket or if you're willing to travel 20 miles beyond Gretna, my 2nd cousin owns Houstin's the butchers in Dumfries and their haggis has won numerous awards I believe. It's a spicey meaty treat and it's made out of the most nutritious parts of the animal, and it's the only way I could conceivably put any of those bits in my mouth! If you ever watch a lion killing somethign to eat it, you'll notice they go for the innard first as they do them the most good.