One day this lady brought a high end purse up to my counter and I proceeded to ring up her purchase.
She handed me her credit card, which was unsigned, so I asked for ID. She gave it to me, and when I swiped her card, it asked me to call our 1-800 number for approval.
I explained to her why I needed to do this, offered the explanation of, "Perhaps since you are out of state, your credit card company is just checking in making sure there is not a problem."
She snatched her ID and credit card right from off of the counter and hissed, "You are just racist and think I don't have enough money to buy this!"
Then she walked out of the store. Boy, was I speechless.