Turns out that my "chicken hoagie" at Mellow Mushroom has a history.
"The Italian sandwich originated in several different Italian-American communities in the Northeastern United States from the late 19th to mid-20th centuries. The popularity of this Italian-American sandwich has grown from its origins in Connecticut, Pennsylvania, Delaware, Maryland, New York, New Jersey, Massachusetts, and Rhode Island to most parts of the United States and Canada, and with the advent of chain restaurants, is now available in many parts of the world. Sociologists Edwin Eames and Howard Robboy identified thirteen different terms for the submarine sandwich in the United States." -- Wikipedia
My friends shared a vegetarian pizza. All good, as people say. :-)