A large pizza from House of Pizza in Brunswick, ME.
The singularly most god-awful pizza I have ever tasted, fresh or frozen, in my entire life.
A terrible, bready, flavorless crust was topped with the most flavor-absent "tomato" sauce, cheese, and assorted toppings (all standard, mind you), that I have every come across. It was the only pizza I have every actually had to salt (fairly liberally) to even choke down.
I am confident that I could make a product 10x better with a boboli crust and generic brand supermarket toppings. The frozen Tombstone I ate a few weeks later was miles above this pizza, flavor-wise.