I work in the home goods section of a big department store, and I had a customer ask if I had a kitchen appliance that was in our ad.
Lady will be "CB" for "cranky butt" and I'll be "me".
CB: "Excuse me, where are the [blankity blank]" shows me the ad
I can't even remember what she asked for but I remember it was something that went fast because it was on a good sale.
Me: "Oh I'm sorry, I've sold out of that item."
CB: "What do you mean you don't have it!? It was in the ad! That's false advertising!"
Me: completely bewildered by her thought process "I... I'm sorry, but it was a popular item and I sold out fast. I can check another store for you"
CB: "No! If it's in the ad you should have it! This is false advertising and I will be calling corporate about this!"
Me: "Um, ok. If you still want it I can help you order it online?"
She refused my help again and went on and on about how it was false advertising and that she was going to be calling corporate. I realized that I couldn't help her any further, apologized again, and told her to have a nice day.
Seriously!? No where in that ad did it say that my specific store was going to have them in stock the day you come in. Other people exist and want to buy things too.
Tldr; lady gets angry when I sold out of an item in the ad and calls it false advertising.