Well, it's definitely parodying the last supper, but the way I see it, it's really a stab at McDonalds. They're kind of considered the holy temple of fast food, and with their "one bazillion served a day" claim to fame, it seems there's no end to those who pray at the alter of two all beef patties, special sauce, lettuce, cheese, pcikes, onions on a sesame seed bun, y'know?