For me, bad toppings aren't enough; in order to be a nightmare pizza:
1) It has to be made by Dominoes. In my experience, no other pizza chain has a more consistent rate of garbage pizza, no matter what you tell them on the phone. The guy who picks up must sound like he's not legal to work, and must act as though he's on his phone at the time, or else I'll know I haven't called Dominoes.
2) Per Dominoes standards, they have to give me light sauce (approximately a golf ball worth of sauce spread out across an entire pizza) whether I ask for it or not. If I'm sick of being cheated out of sauce and I ask for extra sauce, they have to dump an entire can onto the thing, and keep doing that until the pizza is >50% sauce. There can be no happy medium.
3) I will order it during dinner rush, during which Dominoes regulations prohibit them from putting it in the oven for longer than 3 minutes. The pizza crust must be exactly one stage above raw dough. I won't be ordering pepperoni, but if I had, there would have to be no indication that it had ever gone near an oven.
4) The toppings must include pineapple, black olives, and any other sweet ingredient that seeps into the cheese so that I can't taste anything else, even if I remove them.
5) Finally, the driver must not be permitted to put my pizza in any kind of thermal bag. Instead, he must keep the pizza on the seat next to him, and drive with the window open, even in the winter. He must spend a minimum of 30 seconds stopped in the middle of the road outside my house, or any house within 2-3 houses of mine, so that I am confident he can't read the numbers. He must wait until the pizza is completely dry between the cuts and the cheese has been to congeal before he can bring it to me. He must act way too happy to be working for Dominoes.
6) The pizza must somehow immediately become inedible if I don't finish the thing in under 5 minutes. It must expel 100% of its remaining moisture if I refrigerate it, even in an air-tight container. It must become various consistencies of cardboard if I attempt to reheat it.
Only when all of the above criteria are met can I enjoy my average Dominoes experie-I mean, nightmare pizza.