Not a horror story but it always makes me laugh when I think about it.
I worked at a big box store similar to best buy when the Wii u first came out. After months of Wii u's being impossible to find we finally had some stock in.
I was helping another customer on a busy day when a guy stopped me to ask the price on the Wii u.
Customer: how much is the Wii u console?
Me: it's $400 cad plus tax.
Customer: yeah that's too much money, can you do any better on the price?
Me: yeah for sure, for you I can give it to you for $399.99.
Customer: that's much better. I'll take two.
Source: https://www.reddit.com/r/AskReddit/comments/bicr5z/gamestop_employees_of_reddit_what_are_some_of/elzuzyz/