It's not exactly fast food, but Cheeburger Cheeburger (I think it's a national chain) has the best chain burger I have ever eaten. I was sceptical at first, since they're not cheap, but you get unlimited toppings from this massive list. One third pound of grilled cow on a fresh bun, with salsa, jalapenos, black olives, cheddar jack, red peppers, red onions, tomato, lettuce, and hot sauce... it was like my mouth had an orgasm.
And I don't mean that in the way JJL is thinking of mouth orgasms.
*--For behavior unbecoming anyone, perpetrated in real time over an extended--AH, FUCK IT! MORE MALIBU, BITCHES!!