Customers who ruin their own food and complain are the worst!

I Had two notable instances where customers did this. Sorry if too long, I just don't wanna miss too many details.

We had a mother and her 20 year old son come in and they seemed completely fine. When it came time to order the mother orders fish tacos and the son a taco salad. Taco salads come in a tortilla bowl with beans, choice of meat, Lettuce, pico, sour cream, and guacamole. Halfway through their meal i go and check how everything is, and they ask for a cup of beans and a cup of sour cream and I think, maybe they want it for the chips since they wanted the bigger cup. I bring both and ask if they need anything else and went on my way. When I checked back later I see the taco salad bowl OVERFLOWING with beans and sour cream it looked like chunky ice cream with bits of lettuce strewn about. I look at their faces and they both are grossed out. I asked what happened, and they proceed to tell me that they tried to "fix" the taco salad since there simply was not enough beans and sour cream. So their solution was to just dump an entire cup of beans and sour cream directly on top! Obviously they didn't eat it so I took the salad and removed the charges for the sour cream and beans. but since the son had eaten the majority of the salad the manager made the decision to still charge for it. That evening we got a bad review claiming that the taco salad was gross and mentioned how I said it looked like ice cream, what they failed to mention was that they ruined it themselves!!! If they just told me there wasn't enough beans and sour cream when I asked if everything was ok, This wouldn't have been an issue.

The second Story was more recent.

We had a woman come in with her father, first- timers. They seemed very eager to order and immediately began asking about the enchiladas. Enchiladas are rolled corn tortillas with filling of their choice and sauce of their choice on top. They asked if we could put whole beans inside the Enchiladas, and I told them we could but there would be a small charge for the whole beans. So they requested for refried instead since they have no additional charge. I strongly suggested otherwise since the beans would leak out of the enchilada and wouldn't be as good as just meat or cheese filling. They insisted saying they had it at another restaurant so I relented, and wrote it down. Next they asked if we could use Flour tortillas instead of corn and yet again I suggested otherwise, due to our flour tortillas being more doughy and small they would dry up while cooking and wouldn't absorb the sauce as well as corn tortillas And they insisted once again they had it before and it was good and to just trust them on this. so I sent the order, saw the cooks "What the fuck is this" face and waited. I bring over the dry looking enchiladas with beans seeping out. aaaaaaaaaaaaaannndd.... They hated it. Said it was too dry and the beans weren't staying in the enchiladas. To resist saying I TOLD YOU SO, I just offered to take the plates and remove them from the bill and so I did. And they left quickly after paying for their drinks. Thankfully they left no negative reviews but still, it irked me deeply.

I would love to hear about your annoying customers!