Here at Cool Culinaria, we see all sorts of odd foods on menus but this made us stop in our tracks. It was in a window of a noodle shop on Broadway in New York's Upper West Side. Spam Sushi, odd or not so odd?
Raphael Brion, Editor of Eater National tells us that it is a popular Hawaiian dish called Spam Musubi: "composed a slice of grilled Spam on top of a block of rice, wrapped together with nori dried seaweed in the tradition of Japanese omusubi"
A bit more research reveals that in South Korea Spam is something of highly prized food and that it is "tastiest when served with white rice" and gim (a type of seaweed used in certain hand rolls). Apparently, Spam tastes different in South Korea because the Koreans use higher-quality ingredients than 'normal' Spam. You can also buy Spam in gift-sets that can be given when visiting people's homes.
More here at Wikipedia/Spam and Wikipedia/Spam Musubi. And we can't let this opportunity go by without giving a nod to the classic 1970 Monty Python sketch where the word Spam is uttered at least 132 times including "Lobster Thermidor aux crevettes with a Mornay sauce, garnished with truffle pâté, brandy and a fried egg on top and Spam":