What a wonderfully amusing thread. Thanks especially to PamNY for starting it and Eden for 'The Gallery of Regrettable Foods'!
Edit: On Spam, just be grateful you didn't have an aunt who made a curry with it and processed canned peas, then served it up with rice. I'm from Southeast Asia originally where we got a lot of processed Western food which was often given a local twist - a bit like the sushi mentioned earlier. That was a long time ago though. I still steer well clear of Spam. And processed cheese in blue boxes.