I'm working for a big furniture company in a department which has many spare parts. We have no regular stock for the spare parts. We just have what we got, maybe from a broken customer return, from displays and so on.
One big rule of our policy is that we don't do reservations. It doesn't matter why, who, when, where, we just don't do it. One reason is that we simply don't have enough space for it in "the magical back." And another info, just for this story, everybody in our department happens to be Caucasian (it's Germany, so that is very common).
In this nice story, I get approached by a lovely elderly lady:
EL: "Hello, while moving I broke a part of my [furniture], so I need [spare part]."
Me: "Hey, that's a tricky one. If you're lucky we got one over there, but I don't think we have some of them right now. Let's just take a look together."
We are looking.
Me: "I'm sorry, I was right, currently we don't have [spare part]."
EL: "But your Indian coworker told me the last time that he will save [spare part] for me."
EL: "NO, your Indian coworker promised to save [spare part] for me. I live [far far away], so he told me there will be my [spare part] for me when I come back next time. So just give me my spare part!"
Me: "I'm really sorry, but I don't have any Indian coworker. And..."
EL: "Maybe he was from Iraq!"
Me: "There is just nobody who fits that description. Plus, it's our policy that we don't do reservations, we simply don't have any space for that."
EL: Now stop that nonsense and give me my [sparepart]! Or get me your indian coworker, he will confirm that I'm telling the truth!!!
That was the moment my team leader jumped in and told her the same. Which didn't help, she was insisting that the Indian (or Iraqi) coworker promised her that. She finally left, bitching that we were jerks and liars...